Compare 21001 vs 21005
| Property | 21001 | 21005 |
|---|---|---|
| Type | prime | semiprime |
| Unique factors | 1 | 2 |
| Total factors | 1 | 2 |
| Prime factorization | 210011 | 51 × 42011 |
| Prime factorization | 21001 | 5 × 4201 |
| Divisors count | 2 | 4 |
| Divisors | 1, 21001 | 1, 5, 4201, 21005 |
| Number of properties | 5 | 1 |
| Chen primes | 1162nd | |
| Harmonic primes | 867th | |
| Isolated primes | 1648th | |
| Primes | 2361st | |
| Pythagorean primes | 1173rd | |
| Semiprimes | 5330th | |
| Roman numberals | ||
| Base 2 | 1010010000010012 | 1010010000011012 |
| Base 3 | 10012102113 | 10012102223 |
| Base 4 | 110200214 | 110200314 |
| Base 5 | 11330015 | 11330105 |
| Base 6 | 2411216 | 2411256 |
| Base 7 | 1151417 | 1151457 |
| Base 8 | 510118 | 510158 |
| Base 9 | 317249 | 317289 |
| Base 10 | 2100110 | 2100510 |
| Base 11 | 1486211 | 1486611 |
| Base 12 | 101a112 | 101a512 |
| Base 13 | 973613 | 973a13 |
| Base 14 | 792114 | 792514 |
| Base 15 | 635115 | 635515 |
| Base 16 | 520916 | 520d16 |