12123303131123 has 4 divisors (see below), whose sum is σ = 12123324164160. Its totient is φ = 12123282098088.

The previous prime is 12123303131053. The next prime is 12123303131167. The reversal of 12123303131123 is 32113130332121.

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-12123303131123 is a prime.

It is a super-2 number, since 2×12123303131123² (a number of 27 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 = 12123303131092 and 12123303131101.

It is not an unprimeable number, because it can be changed into a prime (12123303131183) 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, 9626840 + ... + 10813077.

It is an arithmetic number, because the mean of its divisors is an integer number (3030831041040).

Almost surely, 2^{12123303131123} is an apocalyptic number.

12123303131123 is a deficient number, since it is larger than the sum of its proper divisors (21033037).

12123303131123 is an equidigital number, since it uses as much as digits as its factorization.

12123303131123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21033036.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 12123303131123 its reverse (32113130332121), we get a palindrome (44236433463244).

The spelling of 12123303131123 in words is "twelve trillion, one hundred twenty-three billion, three hundred three million, one hundred thirty-one thousand, one hundred twenty-three".