21736924 has 36 divisors (see below), whose sum is σ = 42334432. Its totient is φ = 9757440.

The previous prime is 21736879. The next prime is 21736933. The reversal of 21736924 is 42963712.

It is a self number, because there is not a number n which added to its sum of digits gives 21736924.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46717 + ... + 47179.

Almost surely, 2^21736924 is an apocalyptic number.

It is an amenable number.

21736924 is a deficient number, since it is larger than the sum of its proper divisors (20597508).

21736924 is a wasteful number, since it uses less digits than its factorization.

21736924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586 (or 573 counting only the distinct ones).

The product of its digits is 18144, while the sum is 34.

The square root of 21736924 is about 4662.2874214274. The cubic root of 21736924 is about 279.0825584398.

The spelling of 21736924 in words is "twenty-one million, seven hundred thirty-six thousand, nine hundred twenty-four".