21852396 has 96 divisors (see below), whose sum is σ = 59996160. Its totient is φ = 6868800.

The previous prime is 21852379. The next prime is 21852401. The reversal of 21852396 is 69325812.

21852396 is a `hidden beast` number, since 218 + 52 + 396 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 21852396.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204175 + ... + 204281.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^21852396 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 21852396, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29998080).

21852396 is an abundant number, since it is smaller than the sum of its proper divisors (38143764).

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

21852396 is a wasteful number, since it uses less digits than its factorization.

21852396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 204 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 21852396 is about 4674.6546396499. The cubic root of 21852396 is about 279.5758714834.

The spelling of 21852396 in words is "twenty-one million, eight hundred fifty-two thousand, three hundred ninety-six".