21852736 has 28 divisors (see below), whose sum is σ = 45648880. Its totient is φ = 10350720.

The previous prime is 21852683. The next prime is 21852749. The reversal of 21852736 is 63725812.

It is a happy 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, 7770 + ... + 10201.

Almost surely, 2^21852736 is an apocalyptic number.

It is an amenable number.

21852736 is an abundant number, since it is smaller than the sum of its proper divisors (23796144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21852736 is a wasteful number, since it uses less digits than its factorization.

21852736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18002 (or 17992 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 21852736 is about 4674.6910058313. The cubic root of 21852736 is about 279.5773214434.

The spelling of 21852736 in words is "twenty-one million, eight hundred fifty-two thousand, seven hundred thirty-six".