321 in Words
How do you write 321 in words?
The number 321 is written three hundred twenty-one in words. As an ordinal it is three hundred twenty-first, and on a check you would write Three hundred twenty-one and 00/100.
Last updated 24 August 2026
Other ways to write it
| Cardinal | three hundred twenty-one |
|---|---|
| Ordinal | three hundred twenty-first |
| Currency | three hundred twenty-one dollars |
| Check format | Three hundred twenty-one and 00/100 |
How 321 is written
321 is the sum of its place values, 300 + 20 + 1, and is written three hundred twenty-one.
Its ordinal form is three hundred twenty-first — only the final element takes the ordinal ending — and on a check the amount line reads "Three hundred twenty-one and 00/100", where 00/100 stands for zero cents.
British English inserts "and" before the last part, giving three hundred and twenty-one, where American English writes three hundred twenty-one without it.
For house-style rules on spelling out numbers, see the Chicago Manual of Style.
Facts about 321
- 321 is an odd number.
- It is not a prime number.
- Digit sum: 6.
- Roman numerals: CCCXXI.
- Binary: 101000001.
- Hexadecimal: 141.
| Digit | Place |
|---|---|
| 3 | hundreds |
| 2 | tens |
| 1 | ones |
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Frequently asked questions
How do you write 321 in words?
321 in words is "three hundred twenty-one".
How do you spell 321?
321 is spelled "three hundred twenty-one".
How do you write 321 on a check?
On a check, write "Three hundred twenty-one and 00/100".