82177560021 has 16 divisors (see below), whose sum is σ = 113146848320. Its totient is φ = 53020033920.

The previous prime is 82177560007. The next prime is 82177560071. The reversal of 82177560021 is 12006577128.

It is not a de Polignac number, because 82177560021 - 2²⁵ = 82144005589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82177560071) 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, 2908120 + ... + 2936241.

It is an arithmetic number, because the mean of its divisors is an integer number (7071678020).

Almost surely, 2^82177560021 is an apocalyptic number.

It is an amenable number.

82177560021 is a deficient number, since it is larger than the sum of its proper divisors (30969288299).

82177560021 is a wasteful number, since it uses less digits than its factorization.

82177560021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5844516.

The product of its (nonzero) digits is 47040, while the sum is 39.

The spelling of 82177560021 in words is "eighty-two billion, one hundred seventy-seven million, five hundred sixty thousand, twenty-one".