21796904 has 16 divisors (see below), whose sum is σ = 40938720. Its totient is φ = 10879920.

The previous prime is 21796903. The next prime is 21796921. The reversal of 21796904 is 40969712.

It is not an unprimeable number, because it can be changed into a prime (21796903) 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, 3557 + ... + 7499.

It is an arithmetic number, because the mean of its divisors is an integer number (2558670).

Almost surely, 2^21796904 is an apocalyptic number.

It is an amenable number.

21796904 is a deficient number, since it is larger than the sum of its proper divisors (19141816).

21796904 is a wasteful number, since it uses less digits than its factorization.

21796904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4640 (or 4636 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 21796904 is about 4668.7154550261. The cubic root of 21796904 is about 279.3390191172.

The spelling of 21796904 in words is "twenty-one million, seven hundred ninety-six thousand, nine hundred four".