How to spell 21
21 is spelled twenty-one in English.
Quick reference
| US English (Cardinal) | twenty-one |
|---|---|
| Ordinal (21st) | twenty-first |
| On a US Check | Twenty-one and 00/100 dollars |
| Roman Numeral | XXI |
| Binary / Hexadecimal | 10101₂ · 0x15 |
How it's built
- 2 in the tens place = twenty
- 1 in the ones place = one
On a check
To write $21.00 on a check, the words line reads:
Twenty-one and 00/100