312111222123 has 4 divisors (see below), whose sum is σ = 416148296168. Its totient is φ = 208074148080.

The previous prime is 312111222119. The next prime is 312111222131. The reversal of 312111222123 is 321222111213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321222111213 = 3 ⋅107074037071.

It is not a de Polignac number, because 312111222123 - 2² = 312111222119 is a prime.

It is a super-2 number, since 2×312111222123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 312111222123.

It is not an unprimeable number, because it can be changed into a prime (312111222023) 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, 52018537018 + ... + 52018537023.

It is an arithmetic number, because the mean of its divisors is an integer number (104037074042).

Almost surely, 2^312111222123 is an apocalyptic number.

312111222123 is a deficient number, since it is larger than the sum of its proper divisors (104037074045).

312111222123 is a wasteful number, since it uses less digits than its factorization.

312111222123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104037074044.

The product of its digits is 288, while the sum is 21.

Adding to 312111222123 its reverse (321222111213), we get a palindrome (633333333336).

The spelling of 312111222123 in words is "three hundred twelve billion, one hundred eleven million, two hundred twenty-two thousand, one hundred twenty-three".