12312113121 has 72 divisors (see below), whose sum is σ = 22417467072. Its totient is φ = 6373857600.

The previous prime is 12312113119. The next prime is 12312113129. The reversal of 12312113121 is 12131121321.

It is not a de Polignac number, because 12312113121 - 2¹ = 12312113119 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12312113094 and 12312113103.

It is not an unprimeable number, because it can be changed into a prime (12312113129) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2337631 + ... + 2342891.

Almost surely, 2^12312113121 is an apocalyptic number.

12312113121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12312113121 is a deficient number, since it is larger than the sum of its proper divisors (10105353951).

12312113121 is a wasteful number, since it uses less digits than its factorization.

12312113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603 (or 5589 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

Adding to 12312113121 its reverse (12131121321), we get a palindrome (24443234442).

The spelling of 12312113121 in words is "twelve billion, three hundred twelve million, one hundred thirteen thousand, one hundred twenty-one".