Compare 21139 vs 21145
| Property | 21139 | 21145 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 211391 | 51 × 42291 |
| Prime factorization | 21139 | 5 × 4229 |
| Divisors count | 2 | 4 |
| Divisors | 1, 21139 | 1, 5, 4229, 21145 |
| Number of properties | 5 | 1 |
| Cousin primes (1st member) | 360th | |
| Good primes | 266th | |
| Isolated primes | 1656th | |
| Lucky primes | 385th | |
| Primes | 2375th | |
| Semiprimes | 5361st | |
| Roman numberals | ||
| Base 2 | 1010010100100112 | 1010010100110012 |
| Base 3 | 10012222213 | 10020000113 |
| Base 4 | 110221034 | 110221214 |
| Base 5 | 11340245 | 11340405 |
| Base 6 | 2415116 | 2415216 |
| Base 7 | 1154267 | 1154357 |
| Base 8 | 512238 | 512318 |
| Base 9 | 318879 | 320049 |
| Base 10 | 2113910 | 2114510 |
| Base 11 | 1497811 | 1498311 |
| Base 12 | 1029712 | 102a112 |
| Base 13 | 981113 | 981713 |
| Base 14 | 79bd14 | 79c514 |
| Base 15 | 63e415 | 63ea15 |
| Base 16 | 529316 | 529916 |