21880904 has 32 divisors (see below), whose sum is σ = 43659000. Its totient is φ = 10245120.

The previous prime is 21880879. The next prime is 21880919. The reversal of 21880904 is 40908812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20884900 + 996004 = 4570^2 + 998^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47234 + ... + 47694.

Almost surely, 2^21880904 is an apocalyptic number.

It is an amenable number.

21880904 is a deficient number, since it is larger than the sum of its proper divisors (21778096).

21880904 is a wasteful number, since it uses less digits than its factorization.

21880904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 833 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 21880904 is about 4677.7028550347. The cubic root of 21880904 is about 279.6973941695.

The spelling of 21880904 in words is "twenty-one million, eight hundred eighty thousand, nine hundred four".