odd, composite, perfect square, palindrome · 121st positive integer
The number 121
121 is an odd composite number. It is the 121st positive integer.
Quick reference
| Prime factorization | 11 × 11 |
| Divisors | 1, 11, 121 |
| Binary | 1111001 |
| Hexadecimal | 0x79 |
| Roman numeral | CXXI |
| Digit sum | 4 |
| Properties | odd, composite, perfect square, palindrome |
Frequently asked
Is 121 a prime number?
No. 121 is composite. Its prime factorization is 11 × 11.
What are the factors of 121?
The factors (divisors) of 121 are 1, 11, 121.
What is 121 in binary?
121 in binary is 1111001. In hexadecimal it's 79.
What is 121 as a Roman numeral?
121 in Roman numerals is CXXI.
What's the digit sum of 121?
Adding the digits of 121: 1 + 2 + 1 = 4.