21953504 has 24 divisors (see below), whose sum is σ = 43559208. Its totient is φ = 10890880.

The previous prime is 21953489. The next prime is 21953513. The reversal of 21953504 is 40535912.

It is a congruent number.

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, 1574 + ... + 6810.

It is an arithmetic number, because the mean of its divisors is an integer number (1814967).

Almost surely, 2^21953504 is an apocalyptic number.

It is an amenable number.

21953504 is a deficient number, since it is larger than the sum of its proper divisors (21605704).

21953504 is a wasteful number, since it uses less digits than its factorization.

21953504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5378 (or 5370 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 21953504 is about 4685.4566479693. The cubic root of 21953504 is about 280.0063944118.

The spelling of 21953504 in words is "twenty-one million, nine hundred fifty-three thousand, five hundred four".