21089852 has 24 divisors (see below), whose sum is σ = 43321824. Its totient is φ = 8793792.

The previous prime is 21089851. The next prime is 21089857. The reversal of 21089852 is 25898012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21089851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9143 + ... + 11214.

It is an arithmetic number, because the mean of its divisors is an integer number (1805076).

Almost surely, 2^21089852 is an apocalyptic number.

It is an amenable number.

21089852 is an abundant number, since it is smaller than the sum of its proper divisors (22231972).

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

21089852 is a wasteful number, since it uses less digits than its factorization.

21089852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20405 (or 20403 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 21089852 is about 4592.3688876222. The cubic root of 21089852 is about 276.2853416698.

The spelling of 21089852 in words is "twenty-one million, eighty-nine thousand, eight hundred fifty-two".