312123113122 has 4 divisors (see below), whose sum is σ = 468184669686. Its totient is φ = 156061556560.

The previous prime is 312123113117. The next prime is 312123113123. The reversal of 312123113122 is 221311321213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221311321213 = 281 ⋅787584773.

It can be written as a sum of positive squares in only one way, i.e., 267165968161 + 44957144961 = 516881^2 + 212031^2 .

It is a junction number, because it is equal to n+sod(n) for n = 312123113093 and 312123113102.

It is not an unprimeable number, because it can be changed into a prime (312123113123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78030778279 + ... + 78030778282.

Almost surely, 2^312123113122 is an apocalyptic number.

312123113122 is a deficient number, since it is larger than the sum of its proper divisors (156061556564).

312123113122 is a wasteful number, since it uses less digits than its factorization.

312123113122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156061556563.

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

Adding to 312123113122 its reverse (221311321213), we get a palindrome (533434434335).

The spelling of 312123113122 in words is "three hundred twelve billion, one hundred twenty-three million, one hundred thirteen thousand, one hundred twenty-two".