12278892121 has 2 divisors, whose sum is σ = 12278892122. Its totient is φ = 12278892120.

The previous prime is 12278892103. The next prime is 12278892151. The reversal of 12278892121 is 12129887221.

12278892121 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., 11333944521 + 944947600 = 106461^2 + 30740^2 .

It is a cyclic number.

It is not a de Polignac number, because 12278892121 - 2⁹ = 12278891609 is a prime.

It is not a weakly prime, because it can be changed into another prime (12278892151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6139446060 + 6139446061.

It is an arithmetic number, because the mean of its divisors is an integer number (6139446061).

Almost surely, 2^12278892121 is an apocalyptic number.

It is an amenable number.

12278892121 is a deficient number, since it is larger than the sum of its proper divisors (1).

12278892121 is an equidigital number, since it uses as much as digits as its factorization.

12278892121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The spelling of 12278892121 in words is "twelve billion, two hundred seventy-eight million, eight hundred ninety-two thousand, one hundred twenty-one".