21544924 has 12 divisors (see below), whose sum is σ = 38415384. Its totient is φ = 10569104.

The previous prime is 21544903. The next prime is 21544931. The reversal of 21544924 is 42944512.

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, 50602 + ... + 51025.

It is an arithmetic number, because the mean of its divisors is an integer number (3201282).

Almost surely, 2^21544924 is an apocalyptic number.

It is an amenable number.

21544924 is a deficient number, since it is larger than the sum of its proper divisors (16870460).

21544924 is a wasteful number, since it uses less digits than its factorization.

21544924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101684 (or 101682 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 21544924 is about 4641.6509993751. The cubic root of 21544924 is about 278.2584247082.

The spelling of 21544924 in words is "twenty-one million, five hundred forty-four thousand, nine hundred twenty-four".