Twenty-One, or 21, is a character that is made of 21 blocks. Her appearance is early.


Twenty-One originally appeared as literally "Twenty+One". Most fans argued that it wasn't official. This theory was correct. Twenty-One appears to be wearing camping luggage and a swamp-green hat with three rainbow coloured "feathers", because they are 3x7. They wear a stepmask because they are the 6th step squad, and two boots, apricot and red.

Fanmade Designs

TSRITW's design is a skeleton.

Arifmetix's design is swamp green with dark green lips, limbs and teardrop eyes. He is called Camoblock (camouflage) and can make a rainbow transformation to surprise his friends.

MDZ’s design is rainbow and 3 blocks wide (7x3).

Tungster's design has orange limbs and orange goggles.

Mr. Yokai's design is a robot who has many robotic uses. Mainly robot vision and bringing out ball launchers.

thatninjaw's design is a 3 x 7 rectangle, but with a red block on the third h\wide block.


Twenty and One

  • 21 is the first Numberblock to have more than two eyes and one mouth.
    • They are also the first Numberblock to have two heads/faces.
  • 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 coinjoin with each other to form "oo", etc.).
  • It's confirmed that the design is not official but however the other's designs, such as Ninety-Nine, are officially just Nine and Ninety. Which makes Twenty and One basically a glimpse of the future.
    • Which is confirmed; I Can Count To Twenty is actually Twenty-One before figuring out who she is.

Twenty-One's own character

  • Twenty-One is the first Numberblock, to popular belief, exceed Twenty.
  • She is the second character to be a step-squad permanently. The first being Fifteen.
    • One, Three, Six and Ten were step-squads at one point, but they weren't permanent.
  • Twenty-One is the first (if not only) multiple of 7 to be female.
  • She is one of three Numberblocks voiced by Emma Tate.


Numberblocks characters

Discovered Numberblocks

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-Five, Thirty, Forty, Fifty, Sixty, Seventy, Eighty, Ninety, One Hundred, One Thousand, Ten Thousand, One Hundred Thousand, One Million


Big Bad Square, The Terrible Twos, Octoblock, The Three Threes, Octonaughty, Step Squad, The Four Fours

Other Numberblocks

Twenty-Three, Twenty-Four, Thirty-Five, Thirty-Six, Forty-Two, Forty-Nine, Sixty-Four, Ninety-Nine, Two Hundred, Three Hundred

Irrational Numberblocks



Flapjack Snaffler, Blockzilla, Big Tum


Fluffies, Squarey, Numberblobs, Aliens, Rainbows, Flatlanders, Alphablocks


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