Compare 21991 vs 22001

Property	21991	22001
Type	prime	composite number
Unique factors	1	2
Total factors	1	3
Prime factorization	21991¹	7² × 449¹
Prime factorization	21991	7 × 7 × 449
Divisors count	2	6
Divisors	1, 21991	1, 7, 49, 449, 3143, 22001
Number of properties	5	0
Chen primes	1208th
Isolated primes	1720th
Primes	2463rd
Sexy primes (1st member)	742nd
Sexy prime triplets (1st member)	202nd
Roman numberals
Base 2	101010111100111₂	101010111110001₂
Base 3	1010011111₃	1010011212₃
Base 4	11113213₄	11113301₄
Base 5	1200431₅	1201001₅
Base 6	245451₆	245505₆
Base 7	121054₇	121100₇
Base 8	52747₈	52761₈
Base 9	33144₉	33155₉
Base 10	21991₁₀	22001₁₀
Base 11	15582₁₁	15591₁₁
Base 12	10887₁₂	10895₁₂
Base 13	a018₁₃	a025₁₃
Base 14	802b₁₄	8037₁₄
Base 15	67b1₁₅	67bb₁₅
Base 16	55e7₁₆	55f1₁₆