221304012 has 24 divisors (see below), whose sum is σ = 527364096. Its totient is φ = 72198288.

The previous prime is 221303987. The next prime is 221304023. The reversal of 221304012 is 210403122.

It is a super-2 number, since 2×221304012² = 97950931454592288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221303982 and 221304000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195628 + ... + 196755.

It is an arithmetic number, because the mean of its divisors is an integer number (21973504).

Almost surely, 2^221304012 is an apocalyptic number.

It is an amenable number.

221304012 is an abundant number, since it is smaller than the sum of its proper divisors (306060084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221304012 is a wasteful number, since it uses less digits than its factorization.

221304012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 392437 (or 392435 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221304012 is about 14876.2902633688. The cubic root of 221304012 is about 604.8714632564.

Adding to 221304012 its reverse (210403122), we get a palindrome (431707134).

The spelling of 221304012 in words is "two hundred twenty-one million, three hundred four thousand, twelve".