12312120231 has 16 divisors (see below), whose sum is σ = 18244779520. Its totient is φ = 8206009560.

The previous prime is 12312120229. The next prime is 12312120241. The reversal of 12312120231 is 13202121321.

12312120231 is a `hidden beast` number, since 1 + 2 + 312 + 120 + 231 = 666.

It is not a de Polignac number, because 12312120231 - 2¹ = 12312120229 is a prime.

It is a super-2 number, since 2×12312120231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12312120241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55536 + ... + 166458.

It is an arithmetic number, because the mean of its divisors is an integer number (1140298720).

Almost surely, 2^12312120231 is an apocalyptic number.

12312120231 is a deficient number, since it is larger than the sum of its proper divisors (5932659289).

12312120231 is a wasteful number, since it uses less digits than its factorization.

12312120231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115043 (or 115037 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 12312120231 its reverse (13202121321), we get a palindrome (25514241552).

The spelling of 12312120231 in words is "twelve billion, three hundred twelve million, one hundred twenty thousand, two hundred thirty-one".