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21 (alƙalami)

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← 20

21

22 →

← 20 21 22 23 24 25 26 27 28 29 →

← 0 10 20 30 40 50 60 70 80 90 →

ashirin-ɗaya

Factorization ^(en)

3 × 7

ΚΑ´

XXI

10101₂

210₃

Octal ^(en)

25₈

Duodecimal ^(en)

19₁₂

Hexadecimal ^(en)

15₁₆

21

21 (ashirin da ɗaya) alƙalami ne, tsakanin 20 da 22.

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