21274878592 has 64 divisors (see below), whose sum is σ = 46409306400. Its totient is φ = 9634278400.

The previous prime is 21274878571. The next prime is 21274878613. The reversal of 21274878592 is 29587847212.

It is an interprime number because it is at equal distance from previous prime (21274878571) and next prime (21274878613).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 350667 + ... + 406837.

Almost surely, 2^21274878592 is an apocalyptic number.

21274878592 is a gapful number since it is divisible by the number (22) 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 21274878592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23204653200).

21274878592 is an abundant number, since it is smaller than the sum of its proper divisors (25134427808).

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

21274878592 is a wasteful number, since it uses less digits than its factorization.

21274878592 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56465 (or 56453 counting only the distinct ones).

The product of its digits is 4515840, while the sum is 55.

The spelling of 21274878592 in words is "twenty-one billion, two hundred seventy-four million, eight hundred seventy-eight thousand, five hundred ninety-two".