21874404 has 12 divisors (see below), whose sum is σ = 51040304. Its totient is φ = 7291464.

The previous prime is 21874397. The next prime is 21874409. The reversal of 21874404 is 40447812.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21874409) 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 3 ways as a sum of consecutive naturals, for example, 911422 + ... + 911445.

Almost surely, 2^21874404 is an apocalyptic number.

It is an amenable number.

21874404 is an abundant number, since it is smaller than the sum of its proper divisors (29165900).

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

21874404 is a wasteful number, since it uses less digits than its factorization.

21874404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1822874 (or 1822872 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 21874404 is about 4677.0080179534. The cubic root of 21874404 is about 279.6696955407.

The spelling of 21874404 in words is "twenty-one million, eight hundred seventy-four thousand, four hundred four".