21838744 has 16 divisors (see below), whose sum is σ = 43356600. Its totient is φ = 10276992.

The previous prime is 21838723. The next prime is 21838763. The reversal of 21838744 is 44783812.

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, 80154 + ... + 80425.

Almost surely, 2^21838744 is an apocalyptic number.

It is an amenable number.

21838744 is a deficient number, since it is larger than the sum of its proper divisors (21517856).

21838744 is a wasteful number, since it uses less digits than its factorization.

21838744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160602 (or 160598 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 21838744 is about 4673.1941966925. The cubic root of 21838744 is about 279.5176388927.

The spelling of 21838744 in words is "twenty-one million, eight hundred thirty-eight thousand, seven hundred forty-four".