12121111157 has 2 divisors, whose sum is σ = 12121111158. Its totient is φ = 12121111156.

The previous prime is 12121111139. The next prime is 12121111207. The reversal of 12121111157 is 75111112121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7477233841 + 4643877316 = 86471^2 + 68146^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121111157 - 2¹⁶ = 12121045621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121111117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060555578 + 6060555579.

It is an arithmetic number, because the mean of its divisors is an integer number (6060555579).

Almost surely, 2^12121111157 is an apocalyptic number.

It is an amenable number.

12121111157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121111157 is an equidigital number, since it uses as much as digits as its factorization.

12121111157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 140, while the sum is 23.

Adding to 12121111157 its reverse (75111112121), we get a palindrome (87232223278).

The spelling of 12121111157 in words is "twelve billion, one hundred twenty-one million, one hundred eleven thousand, one hundred fifty-seven".