Compare 201209 vs 201221

Property	201209	201221
Type	prime	semiprime
Unique factors	1	2
Total factors	1	2
Prime factorization	201209¹	31¹ × 6491¹
Prime factorization	201209	31 × 6491
Divisors count	2	4
Divisors	1, 201209	1, 31, 6491, 201221
Number of properties	6	1
Chen primes	7562nd
Primes	18078th
Pythagorean primes	9021st
Semiprimes		45508th
Sexy primes (2nd member)	4316th
Sophie germain primes	2065th
Twin primes (1st member)	2166th
Roman numberals
Base 2	110001000111111001₂	110001001000000101₂
Base 3	101020000012₃	101020000122₃
Base 4	301013321₄	301020011₄
Base 5	22414314₅	22414341₅
Base 6	4151305₆	4151325₆
Base 7	1465421₇	1465436₇
Base 8	610771₈	611005₈
Base 9	336005₉	336018₉
Base 10	201209₁₀	201221₁₀
Base 11	128198₁₁	1281a9₁₁
Base 12	98535₁₂	98545₁₂
Base 13	70778₁₃	70787₁₃
Base 14	53481₁₄	5348d₁₄
Base 15	3e93e₁₅	3e94b₁₅
Base 16	311f9₁₆	31205₁₆