Compare 21390 vs 21391
| Property | 21390 | 21391 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 5 | 1 |
| Total factors | 5 | 1 |
| Prime factorization | 21 × 31 × 51 × 231 × 311 | 213911 |
| Prime factorization | 2 × 3 × 5 × 23 × 31 | 21391 |
| Divisors count | 32 | 2 |
| Divisors | 1, 2, 3, 5, 6, 10, 15, 23, 30, 31, 46, 62, 69, 93, 115, 138, 155, 186, 230, 310, 345, 465, 690, 713, 930, 1426, 2139, 3565, 4278, 7130, 10695, 21390 | 1, 21391 |
| Number of properties | 0 | 3 |
| Isolated primes | 1676th | |
| Primes | 2401st | |
| Sexy primes (1st member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100011102 | 1010011100011112 |
| Base 3 | 10021000203 | 10021000213 |
| Base 4 | 110320324 | 110320334 |
| Base 5 | 11410305 | 11410315 |
| Base 6 | 2430106 | 2430116 |
| Base 7 | 1162357 | 1162367 |
| Base 8 | 516168 | 516178 |
| Base 9 | 323069 | 323079 |
| Base 10 | 2139010 | 2139110 |
| Base 11 | 1508611 | 1508711 |
| Base 12 | 1046612 | 1046712 |
| Base 13 | 997513 | 997613 |
| Base 14 | 7b1c14 | 7b1d14 |
| Base 15 | 651015 | 651115 |
| Base 16 | 538e16 | 538f16 |