Compare 21405 vs 21407
| Property | 21405 | 21407 |
|---|---|---|
| Type | composite number | prime |
| Unique factors | 3 | 1 |
| Total factors | 3 | 1 |
| Prime factorization | 31 × 51 × 14271 | 214071 |
| Prime factorization | 3 × 5 × 1427 | 21407 |
| Divisors count | 8 | 2 |
| Divisors | 1, 3, 5, 15, 1427, 4281, 7135, 21405 | 1, 21407 |
| Number of properties | 0 | 6 |
| Chen primes | 1180th | |
| Happy primes | 398th | |
| Isolated primes | 1679th | |
| Long primes | 911th | |
| Primes | 2404th | |
| Sexy primes (2nd member) | 730th | |
| Roman numberals | ||
| Base 2 | 1010011100111012 | 1010011100111112 |
| Base 3 | 10021002103 | 10021002123 |
| Base 4 | 110321314 | 110321334 |
| Base 5 | 11411105 | 11411125 |
| Base 6 | 2430336 | 2430356 |
| Base 7 | 1162567 | 1162617 |
| Base 8 | 516358 | 516378 |
| Base 9 | 323239 | 323259 |
| Base 10 | 2140510 | 2140710 |
| Base 11 | 1509a11 | 150a111 |
| Base 12 | 1047912 | 1047b12 |
| Base 13 | 998713 | 998913 |
| Base 14 | 7b2d14 | 7b3114 |
| Base 15 | 652015 | 652215 |
| Base 16 | 539d16 | 539f16 |