421 in Roman Numerals
CDXXI
Roman numeral for 421
The number 421 is written as CDXXI in Roman numerals.
Convert any number — 1 to 3,999,999
How CDXXI is formed
| CD | 400 | |
| X | ×2 | 20 |
| I | 1 | |
| CDXXI | 421 |
Nearby numbers
About this number
Uses subtractive notation: CD (400). Written with 5 characters.
Base Symbols
I=1V=5X=10L=50C=100D=500M=1000
See also: What is CDXXI? · Chart 100–1000