21985852 has 24 divisors (see below), whose sum is σ = 44128224. Its totient is φ = 9388992.

The previous prime is 21985837. The next prime is 21985853. The reversal of 21985852 is 25858912.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21985853) 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, 7638 + ... + 10114.

It is an arithmetic number, because the mean of its divisors is an integer number (1838676).

Almost surely, 2^21985852 is an apocalyptic number.

It is an amenable number.

21985852 is an abundant number, since it is smaller than the sum of its proper divisors (22142372).

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

21985852 is a wasteful number, since it uses less digits than its factorization.

21985852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805 (or 2803 counting only the distinct ones).

The product of its digits is 57600, while the sum is 40.

The square root of 21985852 is about 4688.9073354034. The cubic root of 21985852 is about 280.1438546511.

The spelling of 21985852 in words is "twenty-one million, nine hundred eighty-five thousand, eight hundred fifty-two".