12123120311 has 2 divisors, whose sum is σ = 12123120312. Its totient is φ = 12123120310.

The previous prime is 12123120287. The next prime is 12123120313. The reversal of 12123120311 is 11302132121.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12123120311 is a prime.

Together with 12123120313, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12123120311.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12123120313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6061560155 + 6061560156.

It is an arithmetic number, because the mean of its divisors is an integer number (6061560156).

Almost surely, 2^12123120311 is an apocalyptic number.

12123120311 is a deficient number, since it is larger than the sum of its proper divisors (1).

12123120311 is an equidigital number, since it uses as much as digits as its factorization.

12123120311 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 12123120311 its reverse (11302132121), we get a palindrome (23425252432).

The spelling of 12123120311 in words is "twelve billion, one hundred twenty-three million, one hundred twenty thousand, three hundred eleven".