21622404 has 12 divisors (see below), whose sum is σ = 50452304. Its totient is φ = 7207464.

The previous prime is 21622339. The next prime is 21622417. The reversal of 21622404 is 40422612.

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

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, 900922 + ... + 900945.

Almost surely, 2^21622404 is an apocalyptic number.

It is an amenable number.

21622404 is an abundant number, since it is smaller than the sum of its proper divisors (28829900).

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

21622404 is a wasteful number, since it uses less digits than its factorization.

21622404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1801874 (or 1801872 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 21622404 is about 4649.9896774079. The cubic root of 21622404 is about 278.5915839272.

The spelling of 21622404 in words is "twenty-one million, six hundred twenty-two thousand, four hundred four".