812123321218 has 16 divisors (see below), whose sum is σ = 1336271227200. Its totient is φ = 367107476400.

The previous prime is 812123321213. The next prime is 812123321279.

812123321218 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (812123321213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101970318 + ... + 101978281.

It is an arithmetic number, because the mean of its divisors is an integer number (83516951700).

Almost surely, 2^812123321218 is an apocalyptic number.

812123321218 is a deficient number, since it is larger than the sum of its proper divisors (524147905982).

812123321218 is a wasteful number, since it uses less digits than its factorization.

812123321218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203948793.

The product of its digits is 9216, while the sum is 34.

The spelling of 812123321218 in words is "eight hundred twelve billion, one hundred twenty-three million, three hundred twenty-one thousand, two hundred eighteen".