Compare 201919 vs 202121
| Property | 201919 | 202121 |
|---|---|---|
| Type | prime | prime |
| Unique factors | 1 | 1 |
| Total factors | 1 | 1 |
| Prime factorization | 2019191 | 2021211 |
| Prime factorization | 201919 | 202121 |
| Divisors count | 2 | 2 |
| Divisors | 1, 201919 | 1, 202121 |
| Number of properties | 5 | 6 |
| Chen primes | 7585th | 7591st |
| Cousin primes (1st member) | 2154th | |
| Harmonic primes | 6809th | 6814th |
| Isolated primes | 13795th | 13812th |
| Primes | 18140th | 18159th |
| Pythagorean primes | 9066th | |
| Sexy primes (1st member) | 4332nd | |
| Roman numberals | ||
| Base 2 | 1100010100101111112 | 1100010101100010012 |
| Base 3 | 1010202221113 | 1010210202223 |
| Base 4 | 3011023334 | 3011120214 |
| Base 5 | 224301345 | 224314415 |
| Base 6 | 41544516 | 41554256 |
| Base 7 | 15004547 | 15011637 |
| Base 8 | 6122778 | 6126118 |
| Base 9 | 3368749 | 3372289 |
| Base 10 | 20191910 | 20212110 |
| Base 11 | 12878311 | 12894711 |
| Base 12 | 98a2712 | 98b7512 |
| Base 13 | 70ba313 | 70cca13 |
| Base 14 | 5382b14 | 5393314 |
| Base 15 | 3ec6415 | 3ed4b15 |
| Base 16 | 314bf16 | 3158916 |