12768467221 has 2 divisors, whose sum is σ = 12768467222. Its totient is φ = 12768467220.

The previous prime is 12768467197. The next prime is 12768467263. The reversal of 12768467221 is 12276486721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12463266321 + 305200900 = 111639^2 + 17470^2 .

It is a cyclic number.

It is not a de Polignac number, because 12768467221 - 2⁷ = 12768467093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12768467291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6384233610 + 6384233611.

It is an arithmetic number, because the mean of its divisors is an integer number (6384233611).

Almost surely, 2^12768467221 is an apocalyptic number.

It is an amenable number.

12768467221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12768467221 is an equidigital number, since it uses as much as digits as its factorization.

12768467221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 46.

The spelling of 12768467221 in words is "twelve billion, seven hundred sixty-eight million, four hundred sixty-seven thousand, two hundred twenty-one".