odd, prime · 421st positive integer
The number 421
421 is an odd prime number. It is the 421st positive integer.
Quick reference
| Prime factorization | 421 (prime) |
| Divisors | 1, 421 |
| Binary | 110100101 |
| Hexadecimal | 0x1A5 |
| Roman numeral | CDXXI |
| Digit sum | 7 |
| Properties | odd, prime |
Frequently asked
Is 421 a prime number?
Yes. 421 is prime — its only divisors are 1 and itself.
What are the factors of 421?
The factors (divisors) of 421 are 1, 421.
What is 421 in binary?
421 in binary is 110100101. In hexadecimal it's 1A5.
What is 421 as a Roman numeral?
421 in Roman numerals is CDXXI.
What's the digit sum of 421?
Adding the digits of 421: 4 + 2 + 1 = 7.