21976468308 has 72 divisors (see below), whose sum is σ = 57686428800. Its totient is φ = 7045905216.

The previous prime is 21976468307. The next prime is 21976468321. The reversal of 21976468308 is 80386467912.

21976468308 is a `hidden beast` number, since 219 + 7 + 64 + 68 + 308 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21976468307) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 234553 + ... + 314591.

It is an arithmetic number, because the mean of its divisors is an integer number (801200400).

Almost surely, 2^21976468308 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 21976468308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28843214400).

21976468308 is an abundant number, since it is smaller than the sum of its proper divisors (35709960492).

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

21976468308 is a wasteful number, since it uses less digits than its factorization.

21976468308 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80341 (or 80336 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The spelling of 21976468308 in words is "twenty-one billion, nine hundred seventy-six million, four hundred sixty-eight thousand, three hundred eight".