221065564 has 12 divisors (see below), whose sum is σ = 386984304. Its totient is φ = 110498624.

The previous prime is 221065541. The next prime is 221065567. The reversal of 221065564 is 465560122.

221065564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221065567) 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, 10977 + ... + 23719.

It is an arithmetic number, because the mean of its divisors is an integer number (32248692).

Almost surely, 2^221065564 is an apocalyptic number.

It is an amenable number.

221065564 is a deficient number, since it is larger than the sum of its proper divisors (165918740).

221065564 is a wasteful number, since it uses less digits than its factorization.

221065564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17084 (or 17082 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 221065564 is about 14868.2737397453. The cubic root of 221065564 is about 604.6541419622.

The spelling of 221065564 in words is "two hundred twenty-one million, sixty-five thousand, five hundred sixty-four".