12156768121 has 2 divisors, whose sum is σ = 12156768122. Its totient is φ = 12156768120.

The previous prime is 12156768101. The next prime is 12156768161. The reversal of 12156768121 is 12186765121.

It is an a-pointer prime, because the next prime (12156768161) can be obtained adding 12156768121 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7978955625 + 4177812496 = 89325^2 + 64636^2 .

It is a cyclic number.

It is not a de Polignac number, because 12156768121 - 2²³ = 12148379513 is a prime.

It is a super-2 number, since 2×12156768121² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12156768101) 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, 6078384060 + 6078384061.

It is an arithmetic number, because the mean of its divisors is an integer number (6078384061).

Almost surely, 2^12156768121 is an apocalyptic number.

It is an amenable number.

12156768121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12156768121 is an equidigital number, since it uses as much as digits as its factorization.

12156768121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 40.

The spelling of 12156768121 in words is "twelve billion, one hundred fifty-six million, seven hundred sixty-eight thousand, one hundred twenty-one".