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Twenty-One

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This page was last edited on June 17, 2025 at 10:15 PM.

"We have to get the Twenty-One to stop!" — Ones
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“ Hello, brave explorers! ”
 

— Twenty-One, We're Going on a Square Hunt

Twenty-One, or 21, is a Numberblock that is made of 21 blocks.

She is voiced by Emma Tate.

Appearance

Twenty-One has 20 apricot blocks with an orange border and one red block. She has red limbs, pink lips, wears an indigo step mask because she is the 6th step squad, and two socks and boots, both apricot and red. She also wears a camping luggage and a green Tyrolean hat with three rainbow coloured "feathers", because she is 3x7, and can be seen holding a walking stick.

Personality

Twenty-One is friendly, curious, and adventurous. Twenty-One loves to explore numbers and is great at helping new Numberblocks figure themselves out.

As shown in Twenty-One and On, she cannot discover who Twenty-Three is, as they refuse to shift any blocks, saying, "I am happy being me (Twenty and Three)!". She gets disappointed and says that she wants to explore more now instead of letting Twenty-Three be a compound. Twenty takes off the Three and says, "Well, I've got a bus back there!".

Episode Appearances

Total number of appearances: 21 (19 figured-out, 4 compound) + 1 pictured (figured-out)

She has appeared in 12.66% of all Numberblocks episodes, including the crossover episodes.

Arrangements

Twenty-One is usually seen as a 3×7 rectangle or steps.

2D (54/88,983,512,783)

Figured-Out (45)
Compound Only (9)

Captain Hexbeard

Uhh…. - Four
This page has been serial victim to repeat vandalism or unnecessary content adding, so here is a quick disclaimer:

Captain Hexbeard is MALE. Whether this proves/disproves anything about Twenty-One's ordinary gender identity is UNKNOWN until writers for the Learningblocks shows confirm otherwise. Please don't change his gender or you might be considered as a vandal.

Captain Hexbeard is a character mentioned in The Treasure of Hexagon Island. "He" turns out to be Twenty-One, but it’s unknown if he's a real character (that Twenty-One disguises as) or just made up by Twenty-One.

Gallery

Has its own page.

Trivia

Compound (Twenty and One)

  • 21 was the first Numberblock to have more than two eyes and one mouth.
    • She was also the first Numberblock to have two faces.
    • She was also the first compound made up of two genders.
  • The fact that the 21 in I Can Count to Twenty is just 20 and 1 conjoined reflects how the Alphablocks form digraphs and trigraphs in their show (For example: Q conjoins herself with U to form the digraph "qu"; H, with C, S, and T, form "ch", "sh", and "th" respectively; I, G, and H form the trigraph "igh"; two O's conjoin with each other to form "oo", etc.).
Non-answer

Except she asked if there was ever a real one.

Figured-Out (Twenty-One's own character)

  • Twenty-One is the first Numberblock to exceed Twenty.
  • She is the first Numberblock to figure herself out, and without anyone's help.
  • She is the second character to have a permanent step mask. The first such character was Fifteen.
  • She is the 6th triangluar number (step squad).
    • One, Three, Six and Ten had step masks in Step Squads; but the masks weren't permanent.
  • It's possible that Twenty-One had an early design concept before her final one. Her appearance as sketched in the storyboard of We're Going On A Square Hunt (viewable in this compilation) looks quite different. In it, she has no hat or backpack; her face is on the bottom of her blocks; and her hair resembles Seven's.
    • It's also possible that the storyboard was made before the episode Twenty-One and On.
  • She is the first multiple of 7 to be female.
  • She is the first Learningblock to be an explorer, the second being Brown.
  • Her step-mask is navy and not indigo for unknown reasons.
  • Her boots are slightly different from Fifteen's, Twenty-Eight's, and Thirty-Six's boots, as they resemble hiking boots.
  • Twenty-One was the first compound Numberblock figured-out.
  • Her story board design has hair, but when she takes off her hat in The Treasure of Hexagon Island she is bald.
  • She is the smallest Numberblock to not have a vertical arrangement.
  • A fan asked if Captain Hexbeard was a real person in-universe, or if 21 made him up. A straight answer was never provided.
    • She speaks in a Scottish accent.
  • Going by release date order, she and Twenty-Two are the last Numberblocks to be in order of figuration. 25 and 30-100 break this pattern.
  • Twenty-One is the fourth Numberblock whose main arrangement is the same as her factorization, after One, Four, Nine, Sixteen, and before Twenty-Five.
    • She is the only non-square to have this happen.
Numberblocks Discovered Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen, Twenty, Twenty-One, Twenty-Two, Twenty-Three, Twenty-Four, Twenty-Five, Twenty-Six, Twenty-Seven, Twenty-Eight, Twenty-Nine, Thirty, Thirty-One, Thirty-Two, Thirty-Five, Thirty-Six, Forty, Forty-Two, Forty-Five, Forty-Eight, Forty-Nine, Fifty, Fifty-Four, Fifty-Five, Fifty-Six, Sixty, Sixty-Three, Sixty-Four, Seventy, Seventy-Two, Eighty, Eighty-One, Ninety, One Hundred
Undiscovered / Non-physical Ninety-Nine, Two Hundred, Three Hundred, Nine Hundred, One Thousand, Seven Thousand, Ninety Thousand, Two Million, Seven Million, Eight Million, Nine Million, Orders of Magnitude, Compound Numberblocks
Alter-Egos The Terrible Twos, Octoblock, The Three Threes, Octonaughty, Step Squad, The Four Fours
Non-integers Pi
Monsters Flapjack Snaffler, Blockzilla, Big Tum, Twangle
Times Tables One Times Table, Two Times Table, Three Times Table, Four Times Table, Five Times Table, Six Times Table, Seven Times Table, Eight Times Table, Nine Times Table, Ten Times Table
Other Fluffies, Squarey, Oblongy, Numberblobs, Aliens, Rainbows, Flatlanders, Sheep, Birds, What-Iffer, Octo-Computer, Reks and Rekenrek, Alphablocks, Colourblocks
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