21932404 has 24 divisors (see below), whose sum is σ = 41563368. Its totient is φ = 10066560.

The previous prime is 21932401. The next prime is 21932419. The reversal of 21932404 is 40423912.

It can be written as a sum of positive squares in 4 ways, for example, as 11356900 + 10575504 = 3370^2 + 3252^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21932401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9174 + ... + 11314.

It is an arithmetic number, because the mean of its divisors is an integer number (1731807).

Almost surely, 2^21932404 is an apocalyptic number.

It is an amenable number.

21932404 is a deficient number, since it is larger than the sum of its proper divisors (19630964).

21932404 is a wasteful number, since it uses less digits than its factorization.

21932404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355 (or 2353 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 21932404 is about 4683.2044584878. The cubic root of 21932404 is about 279.9166588697.

It can be divided in two parts, 219 and 32404, that added together give a palindrome (32623).

The spelling of 21932404 in words is "twenty-one million, nine hundred thirty-two thousand, four hundred four".