12768121 has 2 divisors, whose sum is σ = 12768122. Its totient is φ = 12768120.

The previous prime is 12768103. The next prime is 12768137. The reversal of 12768121 is 12186721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12110400 + 657721 = 3480^2 + 811^2 .

It is an emirp because it is prime and its reverse (12186721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12768121 - 2⁵ = 12768089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12768121.

It is not a weakly prime, because it can be changed into another prime (12768101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6384060 + 6384061.

It is an arithmetic number, because the mean of its divisors is an integer number (6384061).

Almost surely, 2^12768121 is an apocalyptic number.

It is an amenable number.

12768121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12768121 is an equidigital number, since it uses as much as digits as its factorization.

12768121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 12768121 is about 3573.2507608619. The cubic root of 12768121 is about 233.7270601946.

The spelling of 12768121 in words is "twelve million, seven hundred sixty-eight thousand, one hundred twenty-one".