21072448968 has 64 divisors (see below), whose sum is σ = 53934120000. Its totient is φ = 6858684672.

The previous prime is 21072448951. The next prime is 21072448987. The reversal of 21072448968 is 86984427012.

It is a self number, because there is not a number n which added to its sum of digits gives 21072448968.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161046 + ... + 260922.

It is an arithmetic number, because the mean of its divisors is an integer number (842720625).

Almost surely, 2^21072448968 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 21072448968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26967060000).

21072448968 is an abundant number, since it is smaller than the sum of its proper divisors (32861671032).

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

21072448968 is a wasteful number, since it uses less digits than its factorization.

21072448968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100094 (or 100090 counting only the distinct ones).

The product of its (nonzero) digits is 1548288, while the sum is 51.

The spelling of 21072448968 in words is "twenty-one billion, seventy-two million, four hundred forty-eight thousand, nine hundred sixty-eight".