Compare 21397 vs 21399
| Property | 21397 | 21399 |
|---|---|---|
| Type | prime | composite number |
| Unique factors | 1 | 3 |
| Total factors | 1 | 3 |
| Prime factorization | 213971 | 31 × 71 × 10191 |
| Prime factorization | 21397 | 3 × 7 × 1019 |
| Divisors count | 2 | 8 |
| Divisors | 1, 21397 | 1, 3, 7, 21, 1019, 3057, 7133, 21399 |
| 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 | 1010011100101112 |
| Base 3 | 10021001113 | 10021001203 |
| Base 4 | 110321114 | 110321134 |
| Base 5 | 11410425 | 11410445 |
| Base 6 | 2430216 | 2430236 |
| Base 7 | 1162457 | 1162507 |
| Base 8 | 516258 | 516278 |
| Base 9 | 323149 | 323169 |
| Base 10 | 2139710 | 2139910 |
| Base 11 | 1509211 | 1509411 |
| Base 12 | 1047112 | 1047312 |
| Base 13 | 997c13 | 998113 |
| Base 14 | 7b2514 | 7b2714 |
| Base 15 | 651715 | 651915 |
| Base 16 | 539516 | 539716 |