21594764 has 12 divisors (see below), whose sum is σ = 37856784. Its totient is φ = 10778544.

The previous prime is 21594751. The next prime is 21594779. The reversal of 21594764 is 46749512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1952 + ... + 6855.

It is an arithmetic number, because the mean of its divisors is an integer number (3154732).

Almost surely, 2^21594764 is an apocalyptic number.

It is an amenable number.

21594764 is a deficient number, since it is larger than the sum of its proper divisors (16262020).

21594764 is a wasteful number, since it uses less digits than its factorization.

21594764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9424 (or 9422 counting only the distinct ones).

The product of its digits is 60480, while the sum is 38.

The square root of 21594764 is about 4647.0166773964. The cubic root of 21594764 is about 278.4728250879.

The spelling of 21594764 in words is "twenty-one million, five hundred ninety-four thousand, seven hundred sixty-four".