312123121103 has 4 divisors (see below), whose sum is σ = 312125188368. Its totient is φ = 312121053840.

The previous prime is 312123121061. The next prime is 312123121127. The reversal of 312123121103 is 301121321213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301121321213 = 59 ⋅5103751207.

It is a cyclic number.

It is not a de Polignac number, because 312123121103 - 2⁶ = 312123121039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (312123121133) 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, 787643 + ... + 1115628.

It is an arithmetic number, because the mean of its divisors is an integer number (78031297092).

Almost surely, 2^312123121103 is an apocalyptic number.

312123121103 is a deficient number, since it is larger than the sum of its proper divisors (2067265).

312123121103 is a wasteful number, since it uses less digits than its factorization.

312123121103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2067264.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 312123121103 its reverse (301121321213), we get a palindrome (613244442316).

The spelling of 312123121103 in words is "three hundred twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred three".