21753852 has 12 divisors (see below), whose sum is σ = 50759016. Its totient is φ = 7251280.

The previous prime is 21753839. The next prime is 21753869. The reversal of 21753852 is 25835712.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent 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, 906399 + ... + 906422.

It is an arithmetic number, because the mean of its divisors is an integer number (4229918).

Almost surely, 2^21753852 is an apocalyptic number.

It is an amenable number.

21753852 is an abundant number, since it is smaller than the sum of its proper divisors (29005164).

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

21753852 is a wasteful number, since it uses less digits than its factorization.

21753852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1812828 (or 1812826 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 21753852 is about 4664.1024860095. The cubic root of 21753852 is about 279.1549864077.

The spelling of 21753852 in words is "twenty-one million, seven hundred fifty-three thousand, eight hundred fifty-two".