21572898208 has 48 divisors (see below), whose sum is σ = 44334815616. Its totient is φ = 10313614080.

The previous prime is 21572898203. The next prime is 21572898229. The reversal of 21572898208 is 80289827512.

It is a super-2 number, since 2×21572898208² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21572898203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3397885 + ... + 3404227.

It is an arithmetic number, because the mean of its divisors is an integer number (923641992).

Almost surely, 2^21572898208 is an apocalyptic number.

It is an amenable number.

21572898208 is an abundant number, since it is smaller than the sum of its proper divisors (22761917408).

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

21572898208 is a wasteful number, since it uses less digits than its factorization.

21572898208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10997 (or 10989 counting only the distinct ones).

The product of its (nonzero) digits is 1290240, while the sum is 52.

The spelling of 21572898208 in words is "twenty-one billion, five hundred seventy-two million, eight hundred ninety-eight thousand, two hundred eight".