21056944 has 20 divisors (see below), whose sum is σ = 41794200. Its totient is φ = 10271360.

The previous prime is 21056941. The next prime is 21056951. The reversal of 21056944 is 44965012.

It is not an unprimeable number, because it can be changed into a prime (21056941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15394 + ... + 16705.

It is an arithmetic number, because the mean of its divisors is an integer number (2089710).

Almost surely, 2^21056944 is an apocalyptic number.

It is an amenable number.

21056944 is a deficient number, since it is larger than the sum of its proper divisors (20737256).

21056944 is a wasteful number, since it uses less digits than its factorization.

21056944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32148 (or 32142 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 21056944 is about 4588.7845885376. The cubic root of 21056944 is about 276.1415642883.

The spelling of 21056944 in words is "twenty-one million, fifty-six thousand, nine hundred forty-four".