Compare 21 vs 43

Unique factors21
Total factors21
Prime factorization31 × 71431
Prime factorization3 × 743
Divisors count42
Divisors1, 3, 7, 211, 43
Number of properties112
Additive primes 9th
Centered heptagonal primes 1st
Cousin primes (1st member) 6th
Left-truncatable primes 9th
Lucky primes 6th
Primes 14th
Prime triplets (2nd member) 7th
Prime triplets (3rd member) 6th
Sexy primes (2nd member) 8th
Sexy prime triplets (3rd member) 5th
Twin primes (2nd member) 6th
Wagstaff primes 3rd
Roman numberalsXXIXLIII
Base 21010121010112
Base 3210311213
Base 411142234
Base 54151335
Base 63361116
Base 7307617
Base 8258538
Base 9239479
Base 1021104310
Base 111a113a11
Base 1219123712
Base 1318133413
Base 1417143114
Base 1516152d15
Base 1615162b16
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