21972595399872 has 112 divisors (see below), whose sum is σ = 62788240338432. Its totient is φ = 6741314749440.

The previous prime is 21972595399841. The next prime is 21972595399877. The reversal of 21972595399872 is 27899359527912.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is not an unprimeable number, because it can be changed into a prime (21972595399877) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11818504 + ... + 13550727.

It is an arithmetic number, because the mean of its divisors is an integer number (560609288736).

Almost surely, 2^{21972595399872} is an apocalyptic number.

It is an amenable number.

21972595399872 is an abundant number, since it is smaller than the sum of its proper divisors (40815644938560).

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

21972595399872 is a wasteful number, since it uses less digits than its factorization.

21972595399872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25369606 (or 25369596 counting only the distinct ones).

The product of its digits is 1543147200, while the sum is 78.

The spelling of 21972595399872 in words is "twenty-one trillion, nine hundred seventy-two billion, five hundred ninety-five million, three hundred ninety-nine thousand, eight hundred seventy-two".