Compare 21988 vs 21991

Property	21988	21991
Type	composite number	prime
Unique factors	3	1
Total factors	4	1
Prime factorization	2² × 23¹ × 239¹	21991¹
Prime factorization	2 × 2 × 23 × 239	21991
Divisors count	12	2
Divisors	1, 2, 4, 23, 46, 92, 239, 478, 956, 5497, 10994, 21988	1, 21991
Number of properties	0	5
Chen primes		1208th
Isolated primes		1720th
Primes		2463rd
Sexy primes (1st member)		742nd
Sexy prime triplets (1st member)		202nd
Roman numberals
Base 2	101010111100100₂	101010111100111₂
Base 3	1010011101₃	1010011111₃
Base 4	11113210₄	11113213₄
Base 5	1200423₅	1200431₅
Base 6	245444₆	245451₆
Base 7	121051₇	121054₇
Base 8	52744₈	52747₈
Base 9	33141₉	33144₉
Base 10	21988₁₀	21991₁₀
Base 11	1557a₁₁	15582₁₁
Base 12	10884₁₂	10887₁₂
Base 13	a015₁₃	a018₁₃
Base 14	8028₁₄	802b₁₄
Base 15	67ad₁₅	67b1₁₅
Base 16	55e4₁₆	55e7₁₆