21202599852 has 480 divisors, whose sum is σ = 71541550080. Its totient is φ = 5329981440.

The previous prime is 21202599811. The next prime is 21202599853. The reversal of 21202599852 is 25899520212.

It is a happy number.

21202599852 is a `hidden beast` number, since 2 + 1 + 2 + 0 + 2 + 599 + 8 + 52 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 21202599798 and 21202599807.

It is not an unprimeable number, because it can be changed into a prime (21202599853) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 75453952 + ... + 75454232.

It is an arithmetic number, because the mean of its divisors is an integer number (149044896).

Almost surely, 2^21202599852 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 21202599852, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35770775040).

21202599852 is an abundant number, since it is smaller than the sum of its proper divisors (50338950228).

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

21202599852 is a wasteful number, since it uses less digits than its factorization.

21202599852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The spelling of 21202599852 in words is "twenty-one billion, two hundred two million, five hundred ninety-nine thousand, eight hundred fifty-two".