21911048 has 32 divisors (see below), whose sum is σ = 43234560. Its totient is φ = 10395840.

The previous prime is 21911027. The next prime is 21911059. The reversal of 21911048 is 84011912.

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, 12311 + ... + 13977.

It is an arithmetic number, because the mean of its divisors is an integer number (1351080).

Almost surely, 2^21911048 is an apocalyptic number.

It is an amenable number.

21911048 is a deficient number, since it is larger than the sum of its proper divisors (21323512).

21911048 is a wasteful number, since it uses less digits than its factorization.

21911048 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1757 (or 1753 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 21911048 is about 4680.9238404400. The cubic root of 21911048 is about 279.8257759690.

The spelling of 21911048 in words is "twenty-one million, nine hundred eleven thousand, forty-eight".