52564221 has 40 divisors (see below), whose sum is σ = 84680640. Its totient is φ = 32372352.

The previous prime is 52564217. The next prime is 52564229. The reversal of 52564221 is 12246525.

It is not a de Polignac number, because 52564221 - 2² = 52564217 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52564229) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 80920 + ... + 81566.

It is an arithmetic number, because the mean of its divisors is an integer number (2117016).

Almost surely, 2^52564221 is an apocalyptic number.

52564221 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

52564221 is a deficient number, since it is larger than the sum of its proper divisors (32116419).

52564221 is a wasteful number, since it uses less digits than its factorization.

52564221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735 (or 726 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 52564221 is about 7250.1186886837. The cubic root of 52564221 is about 374.5962374248.

It can be divided in two parts, 525 and 64221, that added together give a palindrome (64746).

The spelling of 52564221 in words is "fifty-two million, five hundred sixty-four thousand, two hundred twenty-one".