21589272791 has 16 divisors (see below), whose sum is σ = 22926322944. Its totient is φ = 20259786624.

The previous prime is 21589272767. The next prime is 21589272833. The reversal of 21589272791 is 19727298512.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21589272791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21589271791) 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, 15128420 + ... + 15129846.

It is an arithmetic number, because the mean of its divisors is an integer number (1432895184).

Almost surely, 2^21589272791 is an apocalyptic number.

21589272791 is a deficient number, since it is larger than the sum of its proper divisors (1337050153).

21589272791 is a wasteful number, since it uses less digits than its factorization.

21589272791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3430.

The product of its digits is 1270080, while the sum is 53.

The spelling of 21589272791 in words is "twenty-one billion, five hundred eighty-nine million, two hundred seventy-two thousand, seven hundred ninety-one".