Compare 221209 vs 221218

Property	221209	221218
Type	prime	semiprime
Unique factors	1	2
Total factors	1	2
Prime factorization	221209¹	2¹ × 110609¹
Prime factorization	221209	2 × 110609
Divisors count	2	4
Divisors	1, 221209	1, 2, 110609, 221218
Number of properties	7	1
Happy primes	2995th
Harmonic primes	7397th
Isolated primes	15036th
Primes	19713th
Pythagorean primes	9835th
Semiprimes		49784th
Sexy primes (2nd member)	4662nd
Sexy prime triplets (3rd member)	930th
Roman numberals
Base 2	110110000000011001₂	110110000000100010₂
Base 3	102020102221₃	102020110021₃
Base 4	312000121₄	312000202₄
Base 5	24034314₅	24034333₅
Base 6	4424041₆	4424054₆
Base 7	1610632₇	1610644₇
Base 8	660031₈	660042₈
Base 9	366387₉	366407₉
Base 10	221209₁₀	221218₁₀
Base 11	14121a₁₁	141228₁₁
Base 12	a8021₁₂	a802a₁₂
Base 13	798c1₁₃	798ca₁₃
Base 14	5a889₁₄	5a894₁₄
Base 15	45824₁₅	4582d₁₅
Base 16	36019₁₆	36022₁₆