12121102012157 has 2 divisors, whose sum is σ = 12121102012158. Its totient is φ = 12121102012156.

The previous prime is 12121102012027. The next prime is 12121102012183. The reversal of 12121102012157 is 75121020112121.

It is an a-pointer prime, because the next prime (12121102012183) can be obtained adding 12121102012157 to its sum of digits (26).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9136479520921 + 2984622491236 = 3022661^2 + 1727606^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121102012157 - 2³² = 12116807044861 is a prime.

It is a super-2 number, since 2×12121102012157² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12121102011157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060551006078 + 6060551006079.

It is an arithmetic number, because the mean of its divisors is an integer number (6060551006079).

Almost surely, 2^{12121102012157} is an apocalyptic number.

It is an amenable number.

12121102012157 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121102012157 is an equidigital number, since it uses as much as digits as its factorization.

12121102012157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 560, while the sum is 26.

Adding to 12121102012157 its reverse (75121020112121), we get a palindrome (87242122124278).

The spelling of 12121102012157 in words is "twelve trillion, one hundred twenty-one billion, one hundred two million, twelve thousand, one hundred fifty-seven".