21703924 has 48 divisors (see below), whose sum is σ = 43436736. Its totient is φ = 9401600.

The previous prime is 21703897. The next prime is 21703967. The reversal of 21703924 is 42930712.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21703892 and 21703901.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95499 + ... + 95725.

It is an arithmetic number, because the mean of its divisors is an integer number (904932).

Almost surely, 2^21703924 is an apocalyptic number.

It is an amenable number.

21703924 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

21703924 is a wasteful number, since it uses less digits than its factorization.

21703924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 334 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 21703924 is about 4658.7470418558. The cubic root of 21703924 is about 278.9412568009.

The spelling of 21703924 in words is "twenty-one million, seven hundred three thousand, nine hundred twenty-four".