12111011111123 has 2 divisors, whose sum is σ = 12111011111124. Its totient is φ = 12111011111122.

The previous prime is 12111011111099. The next prime is 12111011111179. The reversal of 12111011111123 is 32111111011121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12111011111123 - 2⁸ = 12111011110867 is a prime.

It is a super-2 number, since 2×12111011111123² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12111011110123) 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, 6055505555561 + 6055505555562.

It is an arithmetic number, because the mean of its divisors is an integer number (6055505555562).

Almost surely, 2^{12111011111123} is an apocalyptic number.

12111011111123 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111011111123 is an equidigital number, since it uses as much as digits as its factorization.

12111011111123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12, while the sum is 17.

Adding to 12111011111123 its reverse (32111111011121), we get a palindrome (44222122122244).

The spelling of 12111011111123 in words is "twelve trillion, one hundred eleven billion, eleven million, one hundred eleven thousand, one hundred twenty-three".