21564852 has 48 divisors (see below), whose sum is σ = 52581312. Its totient is φ = 6872320.

The previous prime is 21564793. The next prime is 21564929. The reversal of 21564852 is 25846512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25663 + ... + 26489.

It is an arithmetic number, because the mean of its divisors is an integer number (1095444).

Almost surely, 2^21564852 is an apocalyptic number.

It is an amenable number.

21564852 is an abundant number, since it is smaller than the sum of its proper divisors (31016460).

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

21564852 is a wasteful number, since it uses less digits than its factorization.

21564852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 928 (or 926 counting only the distinct ones).

The product of its digits is 19200, while the sum is 33.

The square root of 21564852 is about 4643.7971531926. The cubic root of 21564852 is about 278.3441900777.

The spelling of 21564852 in words is "twenty-one million, five hundred sixty-four thousand, eight hundred fifty-two".