312111212123 has 24 divisors (see below), whose sum is σ = 330949547520. Its totient is φ = 293741482320.

The previous prime is 312111212113. The next prime is 312111212201. The reversal of 312111212123 is 321212111213.

It is not a de Polignac number, because 312111212123 - 2⁶ = 312111212059 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312111212095 and 312111212104.

It is not an unprimeable number, because it can be changed into a prime (312111212113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266533328 + ... + 266534498.

It is an arithmetic number, because the mean of its divisors is an integer number (13789564480).

Almost surely, 2^312111212123 is an apocalyptic number.

312111212123 is a deficient number, since it is larger than the sum of its proper divisors (18838335397).

312111212123 is an equidigital number, since it uses as much as digits as its factorization.

312111212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2039 (or 1656 counting only the distinct ones).

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

Adding to 312111212123 its reverse (321212111213), we get a palindrome (633323323336).

The spelling of 312111212123 in words is "three hundred twelve billion, one hundred eleven million, two hundred twelve thousand, one hundred twenty-three".