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 24 August 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 421 is written
421 is the sum of its place values, 400 + 20 + 1, and is written four hundred twenty-one.
Its ordinal form is four hundred twenty-first — only the final element takes the ordinal ending — and on a check the amount line reads "Four hundred twenty-one and 00/100", where 00/100 stands for zero cents.
British English inserts "and" before the last part, giving four hundred and twenty-one, where American English writes four hundred twenty-one without it.
Its Roman numeral CDXXI uses subtractive notation: CD means 400, written as C before D instead of repeating C.
For house-style rules on spelling out numbers, see the Chicago Manual of Style.
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".