831221141122138 has 64 divisors (see below), whose sum is σ = 1422899433043200. Its totient is φ = 361297465689600.

The previous prime is 831221141122133. The next prime is 831221141122139.

831221141122138 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 831221141122138.

It is not an unprimeable number, because it can be changed into a prime (831221141122133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27631203 + ... + 49253686.

It is an arithmetic number, because the mean of its divisors is an integer number (22232803641300).

Almost surely, 2^{831221141122138} is an apocalyptic number.

831221141122138 is a deficient number, since it is larger than the sum of its proper divisors (591678291921062).

831221141122138 is a wasteful number, since it uses less digits than its factorization.

831221141122138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76885207.

The product of its digits is 36864, while the sum is 40.

The spelling of 831221141122138 in words is "eight hundred thirty-one trillion, two hundred twenty-one billion, one hundred forty-one million, one hundred twenty-two thousand, one hundred thirty-eight".