Compare 1215 vs 1221
| Property | 1215 | 1221 |
|---|---|---|
| Type | composite number | composite number |
| Unique factors | 2 | 3 |
| Total factors | 6 | 3 |
| Prime factorization | 35 × 51 | 31 × 111 × 371 |
| Prime factorization | 3 × 3 × 3 × 3 × 3 × 5 | 3 × 11 × 37 |
| Divisors count | 12 | 8 |
| Divisors | 1, 3, 5, 9, 15, 27, 45, 81, 135, 243, 405, 1215 | 1, 3, 11, 33, 37, 111, 407, 1221 |
| Number of properties | 0 | 0 |
| Roman numberals | MCCXV | MCCXXI |
| Base 2 | 100101111112 | 100110001012 |
| Base 3 | 12000003 | 12000203 |
| Base 4 | 1023334 | 1030114 |
| Base 5 | 143305 | 143415 |
| Base 6 | 53436 | 53536 |
| Base 7 | 33547 | 33637 |
| Base 8 | 22778 | 23058 |
| Base 9 | 16009 | 16069 |
| Base 10 | 121510 | 122110 |
| Base 11 | a0511 | a1011 |
| Base 12 | 85312 | 85912 |
| Base 13 | 72613 | 72c13 |
| Base 14 | 62b14 | 63314 |
| Base 15 | 56015 | 56615 |
| Base 16 | 4bf16 | 4c516 |