2421 in Roman Numerals
2421
MMC (subtracted)DXXI
two thousand four hundred twenty-one
How MMCDXXI is formed
| Place | Value | Symbols |
|---|---|---|
| Thousands | 2000 | MM |
| Hundreds | 400 | C (subtracted)D |
| Tens | 20 | XX |
| Units | 1 | I |
| Total | 2421 | MMCDXXI |
MMCDXXI is written one place at a time, from the largest to the smallest: MM (2000) + CD (400) + XX (20) + I (1) = 2421.
CD is the only subtraction: the C before the D takes away 100, so CD = 400.
Common mistakes
Wrong: MMCCCCXXI
Why isn't 2421 written as MMCCCCXXI?
A symbol can't be repeated four times in a row. 400 is CD (500 − 100), not CCCC, so 2421 is MMCDXXI.
Numbers near 2421
Properties of 2421
- Prime factors
- 3² × 269
- Divisors
- 1, 3, 9, 269, 807, 2421
- Even or odd
- Odd
- Prime number
- No
- Letters in MMCDXXI
- 7
2,421,000 in Roman numerals
With a bar over it (vinculum), M̅M̅C̅D̅X̅X̅I̅ means 2421 × 1,000 = 2,421,000. How Roman numerals work