12031201123 has 4 divisors (see below), whose sum is σ = 12554296848. Its totient is φ = 11508105400.

The previous prime is 12031201111. The next prime is 12031201129. The reversal of 12031201123 is 32110213021.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12031201123 is a prime.

It is a super-2 number, since 2×12031201123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12031201097 and 12031201106.

It is not an unprimeable number, because it can be changed into a prime (12031201129) 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 3 ways as a sum of consecutive naturals, for example, 261547828 + ... + 261547873.

It is an arithmetic number, because the mean of its divisors is an integer number (3138574212).

Almost surely, 2^12031201123 is an apocalyptic number.

12031201123 is a deficient number, since it is larger than the sum of its proper divisors (523095725).

12031201123 is an equidigital number, since it uses as much as digits as its factorization.

12031201123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523095724.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 12031201123 its reverse (32110213021), we get a palindrome (44141414144).

The spelling of 12031201123 in words is "twelve billion, thirty-one million, two hundred one thousand, one hundred twenty-three".