221070564 has 72 divisors (see below), whose sum is σ = 656527872. Its totient is φ = 61836480.

The previous prime is 221070557. The next prime is 221070569. The reversal of 221070564 is 465070122.

221070564 is a `hidden beast` number, since 22 + 10 + 70 + 564 = 666.

It is not an unprimeable number, because it can be changed into a prime (221070569) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 16324 + ... + 26619.

Almost surely, 2^221070564 is an apocalyptic number.

It is an amenable number.

221070564 is an abundant number, since it is smaller than the sum of its proper divisors (435457308).

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

221070564 is a wasteful number, since it uses less digits than its factorization.

221070564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42977 (or 42972 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 221070564 is about 14868.4418820534. The cubic root of 221070564 is about 604.6587005614.

The spelling of 221070564 in words is "two hundred twenty-one million, seventy thousand, five hundred sixty-four".