421 in Words
How do you write 421 in words?
The number 421 is written four hundred twenty one in words. As an ordinal it is four hundred twenty first, and on a check you would write Four hundred twenty one and 00/100.
Last updated 19 June 2026
Other ways to write it
| Cardinal | four hundred twenty one |
|---|---|
| Ordinal | four hundred twenty first |
| Currency | four hundred twenty one dollars |
| Check format | Four hundred twenty one and 00/100 |
How number-to-words spelling works
A cardinal number names a quantity (four hundred twenty one), while an ordinal names a position (four hundred twenty first). English hyphenates compound numbers from twenty-one to ninety-nine and groups digits into thousands, millions, and billions.
For house-style rules on spelling out numbers, see the Chicago Manual of Style, or read our guide to spelling numbers in words.
Facts about 421
- 421 is an odd number.
- It is a prime number.
- Digit sum: 7.
- Roman numerals: CDXXI.
- Binary: 110100101.
- Hexadecimal: 1A5.
| Digit | Place |
|---|---|
| 4 | hundreds |
| 2 | tens |
| 1 | ones |
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Frequently asked questions
How do you write 421 in words?
421 in words is "four hundred twenty one".
How do you spell 421?
421 is spelled "four hundred twenty one".
How do you write 421 on a check?
On a check, write "Four hundred twenty one and 00/100".