311212112123 has 4 divisors (see below), whose sum is σ = 339504122328. Its totient is φ = 282920101920.

The previous prime is 311212112087. The next prime is 311212112153. The reversal of 311212112123 is 321211212113.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 311212112123 - 2¹⁰ = 311212111099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311212112095 and 311212112104.

It is not an unprimeable number, because it can be changed into a prime (311212112153) 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, 14146005086 + ... + 14146005107.

It is an arithmetic number, because the mean of its divisors is an integer number (84876030582).

Almost surely, 2^311212112123 is an apocalyptic number.

311212112123 is a deficient number, since it is larger than the sum of its proper divisors (28292010205).

311212112123 is a wasteful number, since it uses less digits than its factorization.

311212112123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28292010204.

The product of its digits is 144, while the sum is 20.

Adding to 311212112123 its reverse (321211212113), we get a palindrome (632423324236).

The spelling of 311212112123 in words is "three hundred eleven billion, two hundred twelve million, one hundred twelve thousand, one hundred twenty-three".