21096856272 has 40 divisors (see below), whose sum is σ = 54696998176. Its totient is φ = 7006893696.

The previous prime is 21096856213. The next prime is 21096856279. The reversal of 21096856272 is 27265869012.

It is a super-2 number, since 2×21096856272² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21096856279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 780058 + ... + 806649.

Almost surely, 2^21096856272 is an apocalyptic number.

It is an amenable number.

21096856272 is an abundant number, since it is smaller than the sum of its proper divisors (33600141904).

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

21096856272 is a wasteful number, since it uses less digits than its factorization.

21096856272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1586995 (or 1586989 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 21096856272 in words is "twenty-one billion, ninety-six million, eight hundred fifty-six thousand, two hundred seventy-two".