21944504 has 16 divisors (see below), whose sum is σ = 41571600. Its totient is φ = 10858752.

The previous prime is 21944477. The next prime is 21944521. The reversal of 21944504 is 40544912.

It is a super-2 number, since 2×21944504² = 963122511612032, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 13364 + ... + 14915.

It is an arithmetic number, because the mean of its divisors is an integer number (2598225).

Almost surely, 2^21944504 is an apocalyptic number.

It is an amenable number.

21944504 is a deficient number, since it is larger than the sum of its proper divisors (19627096).

21944504 is a wasteful number, since it uses less digits than its factorization.

21944504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28382 (or 28378 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21944504 is about 4684.4961308555. The cubic root of 21944504 is about 279.9681256234.

The spelling of 21944504 in words is "twenty-one million, nine hundred forty-four thousand, five hundred four".