21502852 has 24 divisors (see below), whose sum is σ = 43554560. Its totient is φ = 9097920.

The previous prime is 21502849. The next prime is 21502867. The reversal of 21502852 is 25820512.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2649 + ... + 7072.

Almost surely, 2^21502852 is an apocalyptic number.

It is an amenable number.

21502852 is an abundant number, since it is smaller than the sum of its proper divisors (22051708).

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

21502852 is a wasteful number, since it uses less digits than its factorization.

21502852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9811 (or 9809 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 21502852 is about 4637.1167766189. The cubic root of 21502852 is about 278.0771829927.

The spelling of 21502852 in words is "twenty-one million, five hundred two thousand, eight hundred fifty-two".