312131210122 has 4 divisors (see below), whose sum is σ = 468196815186. Its totient is φ = 156065605060.

The previous prime is 312131210033. The next prime is 312131210129. The reversal of 312131210122 is 221012131213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221012131213 = 12923 ⋅17102231.

It can be written as a sum of positive squares in only one way, i.e., 182415264201 + 129715945921 = 427101^2 + 360161^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 312131210122.

It is not an unprimeable number, because it can be changed into a prime (312131210129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78032802529 + ... + 78032802532.

Almost surely, 2^312131210122 is an apocalyptic number.

312131210122 is a deficient number, since it is larger than the sum of its proper divisors (156065605064).

312131210122 is a wasteful number, since it uses less digits than its factorization.

312131210122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156065605063.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 312131210122 its reverse (221012131213), we get a palindrome (533143341335).

The spelling of 312131210122 in words is "three hundred twelve billion, one hundred thirty-one million, two hundred ten thousand, one hundred twenty-two".