Compare 21390 vs 21397
| Property | 21390 | 21397 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 5 | 1 |
| Total factors | 5 | 1 |
| Prime factorization | 21 × 31 × 51 × 231 × 311 | 213971 |
| Prime factorization | 2 × 3 × 5 × 23 × 31 | 21397 |
| 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, 21397 |
| Number of properties | 0 | 5 |
| Cousin primes (1st member) | 365th | |
| Isolated primes | 1677th | |
| Primes | 2402nd | |
| Pythagorean primes | 1191st | |
| Sexy primes (2nd member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100011102 | 1010011100101012 |
| Base 3 | 10021000203 | 10021001113 |
| Base 4 | 110320324 | 110321114 |
| Base 5 | 11410305 | 11410425 |
| Base 6 | 2430106 | 2430216 |
| Base 7 | 1162357 | 1162457 |
| Base 8 | 516168 | 516258 |
| Base 9 | 323069 | 323149 |
| Base 10 | 2139010 | 2139710 |
| Base 11 | 1508611 | 1509211 |
| Base 12 | 1046612 | 1047112 |
| Base 13 | 997513 | 997c13 |
| Base 14 | 7b1c14 | 7b2514 |
| Base 15 | 651015 | 651715 |
| Base 16 | 538e16 | 539516 |