odd, composite · 221st positive integer
The number 221
221 is an odd composite number. It is the 221st positive integer.
Quick reference
| Prime factorization | 13 × 17 |
| Divisors | 1, 13, 17, 221 |
| Binary | 11011101 |
| Hexadecimal | 0xDD |
| Roman numeral | CCXXI |
| Digit sum | 5 |
| Properties | odd, composite |
Frequently asked
Is 221 a prime number?
No. 221 is composite. Its prime factorization is 13 × 17.
What are the factors of 221?
The factors (divisors) of 221 are 1, 13, 17, 221.
What is 221 in binary?
221 in binary is 11011101. In hexadecimal it's DD.
What is 221 as a Roman numeral?
221 in Roman numerals is CCXXI.
What's the digit sum of 221?
Adding the digits of 221: 2 + 2 + 1 = 5.