12123121831 has 2 divisors, whose sum is σ = 12123121832. Its totient is φ = 12123121830.

The previous prime is 12123121823. The next prime is 12123121837. The reversal of 12123121831 is 13812132121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12123121831 - 2³ = 12123121823 is a prime.

It is a super-2 number, since 2×12123121831² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12123121796 and 12123121805.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123121837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061560915 + 6061560916.

It is an arithmetic number, because the mean of its divisors is an integer number (6061560916).

Almost surely, 2^12123121831 is an apocalyptic number.

12123121831 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123121831 is an equidigital number, since it uses as much as digits as its factorization.

12123121831 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

Adding to 12123121831 its reverse (13812132121), we get a palindrome (25935253952).

The spelling of 12123121831 in words is "twelve billion, one hundred twenty-three million, one hundred twenty-one thousand, eight hundred thirty-one".