21852324 has 72 divisors (see below), whose sum is σ = 60678072. Its totient is φ = 6589440.

The previous prime is 21852317. The next prime is 21852343. The reversal of 21852324 is 42325812.

It can be written as a sum of positive squares in 4 ways, for example, as 396900 + 21455424 = 630^2 + 4632^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24364 + ... + 25244.

It is an arithmetic number, because the mean of its divisors is an integer number (842751).

Almost surely, 2^21852324 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21852324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30339036).

21852324 is an abundant number, since it is smaller than the sum of its proper divisors (38825748).

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

21852324 is a wasteful number, since it uses less digits than its factorization.

21852324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 957 (or 952 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 21852324 is about 4674.6469385399. The cubic root of 21852324 is about 279.5755644311.

The spelling of 21852324 in words is "twenty-one million, eight hundred fifty-two thousand, three hundred twenty-four".