12123311231 has 2 divisors, whose sum is σ = 12123311232. Its totient is φ = 12123311230.

The previous prime is 12123311219. The next prime is 12123311243. The reversal of 12123311231 is 13211332121.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (12123311219) and next prime (12123311243).

It is a cyclic number.

It is not a de Polignac number, because 12123311231 - 2¹⁸ = 12123049087 is a prime.

It is a super-2 number, since 2×12123311231² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123301231) 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 as a sum of consecutive naturals, namely, 6061655615 + 6061655616.

It is an arithmetic number, because the mean of its divisors is an integer number (6061655616).

Almost surely, 2^12123311231 is an apocalyptic number.

12123311231 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123311231 is an equidigital number, since it uses as much as digits as its factorization.

12123311231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216, while the sum is 20.

Adding to 12123311231 its reverse (13211332121), we get a palindrome (25334643352).

The spelling of 12123311231 in words is "twelve billion, one hundred twenty-three million, three hundred eleven thousand, two hundred thirty-one".