221372564 has 12 divisors (see below), whose sum is σ = 442745184. Its totient is φ = 94873944.

The previous prime is 221372563. The next prime is 221372579. The reversal of 221372564 is 465273122.

221372564 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 221372564.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221372561) 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, 3953054 + ... + 3953109.

It is an arithmetic number, because the mean of its divisors is an integer number (36895432).

Almost surely, 2^221372564 is an apocalyptic number.

It is an amenable number.

221372564 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221372564 is a wasteful number, since it uses less digits than its factorization.

221372564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7906174 (or 7906172 counting only the distinct ones).

The product of its digits is 20160, while the sum is 32.

The square root of 221372564 is about 14878.5941540187. The cubic root of 221372564 is about 604.9339125954.

The spelling of 221372564 in words is "two hundred twenty-one million, three hundred seventy-two thousand, five hundred sixty-four".