21252313888 has 96 divisors (see below), whose sum is σ = 45533892096. Its totient is φ = 9705996288.

The previous prime is 21252313883. The next prime is 21252313891. The reversal of 21252313888 is 88831325212.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21252313883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17903631 + ... + 17904817.

It is an arithmetic number, because the mean of its divisors is an integer number (474311376).

Almost surely, 2^21252313888 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 21252313888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22766946048).

21252313888 is an abundant number, since it is smaller than the sum of its proper divisors (24281578208).

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

21252313888 is a wasteful number, since it uses less digits than its factorization.

21252313888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1626 (or 1618 counting only the distinct ones).

The product of its digits is 184320, while the sum is 43.

The spelling of 21252313888 in words is "twenty-one billion, two hundred fifty-two million, three hundred thirteen thousand, eight hundred eighty-eight".