312122113231 has 16 divisors (see below), whose sum is σ = 319840012800. Its totient is φ = 304487143488.

The previous prime is 312122113211. The next prime is 312122113243. The reversal of 312122113231 is 132311221213.

It is a cyclic number.

It is not a de Polignac number, because 312122113231 - 2³¹ = 309974629583 is a prime.

It is a super-2 number, since 2×312122113231² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312122113211) 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, 21454746 + ... + 21469288.

It is an arithmetic number, because the mean of its divisors is an integer number (19990000800).

Almost surely, 2^312122113231 is an apocalyptic number.

312122113231 is a deficient number, since it is larger than the sum of its proper divisors (7717899569).

312122113231 is a wasteful number, since it uses less digits than its factorization.

312122113231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17358.

The product of its digits is 432, while the sum is 22.

Adding to 312122113231 its reverse (132311221213), we get a palindrome (444433334444).

The spelling of 312122113231 in words is "three hundred twelve billion, one hundred twenty-two million, one hundred thirteen thousand, two hundred thirty-one".