21911404 has 12 divisors (see below), whose sum is σ = 38621800. Its totient is φ = 10876608.

The previous prime is 21911399. The next prime is 21911411. The reversal of 21911404 is 40411912.

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, 19149 + ... + 20260.

Almost surely, 2^21911404 is an apocalyptic number.

It is an amenable number.

21911404 is a deficient number, since it is larger than the sum of its proper divisors (16710396).

21911404 is a wasteful number, since it uses less digits than its factorization.

21911404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39552 (or 39550 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 21911404 is about 4680.9618669671. The cubic root of 21911404 is about 279.8272914516.

The spelling of 21911404 in words is "twenty-one million, nine hundred eleven thousand, four hundred four".