21274408160 has 96 divisors (see below), whose sum is σ = 51098729472. Its totient is φ = 8368335360.

The previous prime is 21274408147. The next prime is 21274408229. The reversal of 21274408160 is 6180447212.

It is a self number, because there is not a number n which added to its sum of digits gives 21274408160.

It is a congruent number.

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, 7963625 + ... + 7966295.

It is an arithmetic number, because the mean of its divisors is an integer number (532278432).

Almost surely, 2^21274408160 is an apocalyptic number.

21274408160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21274408160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25549364736).

21274408160 is an abundant number, since it is smaller than the sum of its proper divisors (29824321312).

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

21274408160 is a wasteful number, since it uses less digits than its factorization.

21274408160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496 (or 3488 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The spelling of 21274408160 in words is "twenty-one billion, two hundred seventy-four million, four hundred eight thousand, one hundred sixty".