12111212122157 has 2 divisors, whose sum is σ = 12111212122158. Its totient is φ = 12111212122156.

The previous prime is 12111212122153. The next prime is 12111212122171. The reversal of 12111212122157 is 75122121211121.

12111212122157 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6627025638601 + 5484186483556 = 2574301^2 + 2341834^2 .

It is a cyclic number.

It is not a de Polignac number, because 12111212122157 - 2² = 12111212122153 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12111212122153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6055606061078 + 6055606061079.

It is an arithmetic number, because the mean of its divisors is an integer number (6055606061079).

Almost surely, 2^{12111212122157} is an apocalyptic number.

It is an amenable number.

12111212122157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12111212122157 is an equidigital number, since it uses as much as digits as its factorization.

12111212122157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1120, while the sum is 29.

Adding to 12111212122157 its reverse (75122121211121), we get a palindrome (87233333333278).

The spelling of 12111212122157 in words is "twelve trillion, one hundred eleven billion, two hundred twelve million, one hundred twenty-two thousand, one hundred fifty-seven".