21 (alƙalami)
(an turo daga 21 (adadan))
21 (ashirin da ɗaya) alƙalami ne, tsakanin 20 da 22.
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| Cardinal | ashirin-ɗaya | |||
Factorization (en)  | 3 × 7 | |||
| Greek numeral | ΚΑ´ | |||
| Roman numeral | XXI | |||
| Binary | 101012 | |||
| Ternary | 2103 | |||
| Octal (en) | 258 | |||
| Duodecimal (en) | 1912 | |||
| Hexadecimal (en) | 1516 | |||
