Compare 21 vs 29

Unique factors21
Total factors21
Prime factorization31 × 71291
Prime factorization3 × 729
Divisors count42
Divisors1, 3, 7, 211, 29
Number of properties114
Additive primes 7th
Chen primes 10th
Good primes 4th
Long primes 5th
Lucas primes 5th
Primes 10th
Pythagorean primes 4th
Right-truncatable primes 6th
Sexy primes (2nd member) 6th
Sexy prime quadrupletss (4th member) 2nd
Sexy prime triplets (3rd member) 4th
Solinas primes 9th
Sophie germain primes 6th
Twin primes (1st member) 5th
Roman numberalsXXIXXIX
Base 2101012111012
Base 3210310023
Base 411141314
Base 54151045
Base 6336456
Base 7307417
Base 8258358
Base 9239329
Base 1021102910
Base 111a112711
Base 1219122512
Base 1318132313
Base 1417142114
Base 1516151e15
Base 1615161d16
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