221365612 has 24 divisors (see below), whose sum is σ = 418278896. Its totient is φ = 101901888.

The previous prime is 221365609. The next prime is 221365631. The reversal of 221365612 is 216563122.

221365612 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221365612² = 98005468352269088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15283 + ... + 26005.

Almost surely, 2^221365612 is an apocalyptic number.

It is an amenable number.

221365612 is a deficient number, since it is larger than the sum of its proper divisors (196913284).

221365612 is a wasteful number, since it uses less digits than its factorization.

221365612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11137 (or 11135 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 221365612 is about 14878.3605279614. The cubic root of 221365612 is about 604.9275800663.

The spelling of 221365612 in words is "two hundred twenty-one million, three hundred sixty-five thousand, six hundred twelve".