Compare 21385 vs 21391
| Property | 21385 | 21391 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 4 | 1 |
| Total factors | 4 | 1 |
| Prime factorization | 51 × 71 × 131 × 471 | 213911 |
| Prime factorization | 5 × 7 × 13 × 47 | 21391 |
| Divisors count | 16 | 2 |
| Divisors | 1, 5, 7, 13, 35, 47, 65, 91, 235, 329, 455, 611, 1645, 3055, 4277, 21385 | 1, 21391 |
| Number of properties | 0 | 3 |
| Isolated primes | 1676th | |
| Primes | 2401st | |
| Sexy primes (1st member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100010012 | 1010011100011112 |
| Base 3 | 10021000013 | 10021000213 |
| Base 4 | 110320214 | 110320334 |
| Base 5 | 11410205 | 11410315 |
| Base 6 | 2430016 | 2430116 |
| Base 7 | 1162307 | 1162367 |
| Base 8 | 516118 | 516178 |
| Base 9 | 323019 | 323079 |
| Base 10 | 2138510 | 2139110 |
| Base 11 | 1508111 | 1508711 |
| Base 12 | 1046112 | 1046712 |
| Base 13 | 997013 | 997613 |
| Base 14 | 7b1714 | 7b1d14 |
| Base 15 | 650a15 | 651115 |
| Base 16 | 538916 | 538f16 |