21932808 has 32 divisors (see below), whose sum is σ = 55036800. Its totient is φ = 7283648.

The previous prime is 21932797. The next prime is 21932809. The reversal of 21932808 is 80823912.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21932809) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5473 + ... + 8591.

It is an arithmetic number, because the mean of its divisors is an integer number (1719900).

Almost surely, 2^21932808 is an apocalyptic number.

It is an amenable number.

21932808 is an abundant number, since it is smaller than the sum of its proper divisors (33103992).

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

21932808 is a wasteful number, since it uses less digits than its factorization.

21932808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3421 (or 3417 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 21932808 is about 4683.2475911487. The cubic root of 21932808 is about 279.9183775692.

The spelling of 21932808 in words is "twenty-one million, nine hundred thirty-two thousand, eight hundred eight".