Compare 21397 vs 21405
| Property | 21397 | 21405 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 213971 | 31 × 51 × 14271 |
| Prime factorization | 21397 | 3 × 5 × 1427 |
| Divisors count | 2 | 8 |
| Divisors | 1, 21397 | 1, 3, 5, 15, 1427, 4281, 7135, 21405 |
| Number of properties | 5 | 0 |
| Cousin primes (1st member) | 365th | |
| Isolated primes | 1677th | |
| Primes | 2402nd | |
| Pythagorean primes | 1191st | |
| Sexy primes (2nd member) | 729th | |
| Roman numberals | ||
| Base 2 | 1010011100101012 | 1010011100111012 |
| Base 3 | 10021001113 | 10021002103 |
| Base 4 | 110321114 | 110321314 |
| Base 5 | 11410425 | 11411105 |
| Base 6 | 2430216 | 2430336 |
| Base 7 | 1162457 | 1162567 |
| Base 8 | 516258 | 516358 |
| Base 9 | 323149 | 323239 |
| Base 10 | 2139710 | 2140510 |
| Base 11 | 1509211 | 1509a11 |
| Base 12 | 1047112 | 1047912 |
| Base 13 | 997c13 | 998713 |
| Base 14 | 7b2514 | 7b2d14 |
| Base 15 | 651715 | 652015 |
| Base 16 | 539516 | 539d16 |