21 in Roman Numerals
XXI
21 in Roman numerals is XXI, and is spelled twenty-one.
How 21 breaks down
To write 21 in Roman numerals, combine XX (20) and I (1) to get XXI.
| Value | Roman |
|---|---|
| 20 | XX |
| 1 | I |
| 21 | XXI |
You can open 21 in the converter or browse the full Roman numerals chart.