21 = XXI
Split 21 into 20 + 1 and write each part: XX (20) + I (1) = XXI.
| Symbol | I | V | X | L | C | D | M |
|---|---|---|---|---|---|---|---|
| Value | 1 | 5 | 10 | 50 | 100 | 500 | 1,000 |
Need another number? Use the Roman numeral converter (both directions).
| Number | Roman numeral |
|---|---|
| 17 | XVII |
| 18 | XVIII |
| 19 | XIX |
| 20 | XX |
| 22 | XXII |
| 23 | XXIII |
| 24 | XXIV |
| 25 | XXV |