Compare 1213 vs 1221
| Property | 1213 | 1221 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 12131 | 31 × 111 × 371 |
| Prime factorization | 1213 | 3 × 11 × 37 |
| Divisors count | 2 | 8 |
| Divisors | 1, 1213 | 1, 3, 11, 33, 37, 111, 407, 1221 |
| Number of properties | 7 | 0 |
| Additive primes | 106th | |
| Cousin primes (1st member) | 45th | |
| Emirps | 52nd | |
| Good primes | 49th | |
| Isolated primes | 117th | |
| Primes | 198th | |
| Pythagorean primes | 97th | |
| Roman numberals | MCCXIII | MCCXXI |
| Base 2 | 100101111012 | 100110001012 |
| Base 3 | 11222213 | 12000203 |
| Base 4 | 1023314 | 1030114 |
| Base 5 | 143235 | 143415 |
| Base 6 | 53416 | 53536 |
| Base 7 | 33527 | 33637 |
| Base 8 | 22758 | 23058 |
| Base 9 | 15879 | 16069 |
| Base 10 | 121310 | 122110 |
| Base 11 | a0311 | a1011 |
| Base 12 | 85112 | 85912 |
| Base 13 | 72413 | 72c13 |
| Base 14 | 62914 | 63314 |
| Base 15 | 55d15 | 56615 |
| Base 16 | 4bd16 | 4c516 |