21804664360452 has 96 divisors (see below), whose sum is σ = 55306503598080. Its totient is φ = 6660720408960.

The previous prime is 21804664360447. The next prime is 21804664360481. The reversal of 21804664360452 is 25406346640812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21804664360395 and 21804664360404.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15931378 + ... + 17245814.

It is an arithmetic number, because the mean of its divisors is an integer number (576109412480).

Almost surely, 2^{21804664360452} 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 21804664360452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27653251799040).

21804664360452 is an abundant number, since it is smaller than the sum of its proper divisors (33501839237628).

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

21804664360452 is a wasteful number, since it uses less digits than its factorization.

21804664360452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1316841 (or 1316839 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 51.

The spelling of 21804664360452 in words is "twenty-one trillion, eight hundred four billion, six hundred sixty-four million, three hundred sixty thousand, four hundred fifty-two".