221564652 has 12 divisors (see below), whose sum is σ = 516984216. Its totient is φ = 73854880.

The previous prime is 221564641. The next prime is 221564653. The reversal of 221564652 is 256465122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×221564652² = 98181790031762208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221564653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9231849 + ... + 9231872.

It is an arithmetic number, because the mean of its divisors is an integer number (43082018).

Almost surely, 2^221564652 is an apocalyptic number.

It is an amenable number.

221564652 is an abundant number, since it is smaller than the sum of its proper divisors (295419564).

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

221564652 is a wasteful number, since it uses less digits than its factorization.

221564652 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18463728 (or 18463726 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 221564652 is about 14885.0479340847. The cubic root of 221564652 is about 605.1088318204.

The spelling of 221564652 in words is "two hundred twenty-one million, five hundred sixty-four thousand, six hundred fifty-two".