82187974321 has 4 divisors (see below), whose sum is σ = 86513657200. Its totient is φ = 77862291444.

The previous prime is 82187974289. The next prime is 82187974333. The reversal of 82187974321 is 12347978128.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82187974321 - 2⁵ = 82187974289 is a prime.

It is a super-2 number, since 2×82187974321² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82187974021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162841411 + ... + 2162841448.

It is an arithmetic number, because the mean of its divisors is an integer number (21628414300).

Almost surely, 2^82187974321 is an apocalyptic number.

It is an amenable number.

82187974321 is a deficient number, since it is larger than the sum of its proper divisors (4325682879).

82187974321 is a wasteful number, since it uses less digits than its factorization.

82187974321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4325682878.

The product of its digits is 1354752, while the sum is 52.

The spelling of 82187974321 in words is "eighty-two billion, one hundred eighty-seven million, nine hundred seventy-four thousand, three hundred twenty-one".