12121111012123 has 2 divisors, whose sum is σ = 12121111012124. Its totient is φ = 12121111012122.

The previous prime is 12121111012103. The next prime is 12121111012169. The reversal of 12121111012123 is 32121011112121.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121111012123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121111012123.

It is not a weakly prime, because it can be changed into another prime (12121111012103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060555506061 + 6060555506062.

It is an arithmetic number, because the mean of its divisors is an integer number (6060555506062).

Almost surely, 2^{12121111012123} is an apocalyptic number.

12121111012123 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121111012123 is an equidigital number, since it uses as much as digits as its factorization.

12121111012123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 19.

Adding to 12121111012123 its reverse (32121011112121), we get a palindrome (44242122124244).

The spelling of 12121111012123 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twelve thousand, one hundred twenty-three".