12031320123 has 16 divisors (see below), whose sum is σ = 18075225600. Its totient is φ = 7907908680.

The previous prime is 12031320109. The next prime is 12031320139. The reversal of 12031320123 is 32102313021.

It is not a de Polignac number, because 12031320123 - 2⁴ = 12031320107 is a prime.

It is a super-3 number, since 3×12031320123³ (a number of 31 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12031320096 and 12031320105.

It is not an unprimeable number, because it can be changed into a prime (12031322123) 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, 3136143 + ... + 3139976.

It is an arithmetic number, because the mean of its divisors is an integer number (1129701600).

Almost surely, 2^12031320123 is an apocalyptic number.

12031320123 is a deficient number, since it is larger than the sum of its proper divisors (6043905477).

12031320123 is an equidigital number, since it uses as much as digits as its factorization.

12031320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6276199 (or 6276193 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 12031320123 its reverse (32102313021), we get a palindrome (44133633144).

The spelling of 12031320123 in words is "twelve billion, thirty-one million, three hundred twenty thousand, one hundred twenty-three".