312012111121 has 4 divisors (see below), whose sum is σ = 328433801200. Its totient is φ = 295590421044.

The previous prime is 312012111119. The next prime is 312012111163. The reversal of 312012111121 is 121111210213.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 312012111121 - 2¹ = 312012111119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 312012111095 and 312012111104.

It is not an unprimeable number, because it can be changed into a prime (312012111221) 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, 8210845011 + ... + 8210845048.

It is an arithmetic number, because the mean of its divisors is an integer number (82108450300).

Almost surely, 2^312012111121 is an apocalyptic number.

It is an amenable number.

312012111121 is a deficient number, since it is larger than the sum of its proper divisors (16421690079).

312012111121 is a wasteful number, since it uses less digits than its factorization.

312012111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16421690078.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 312012111121 its reverse (121111210213), we get a palindrome (433123321334).

The spelling of 312012111121 in words is "three hundred twelve billion, twelve million, one hundred eleven thousand, one hundred twenty-one".