12305686721 has 2 divisors, whose sum is σ = 12305686722. Its totient is φ = 12305686720.

The previous prime is 12305686669. The next prime is 12305686733. The reversal of 12305686721 is 12768650321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7767778225 + 4537908496 = 88135^2 + 67364^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12305686721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12305686321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6152843360 + 6152843361.

It is an arithmetic number, because the mean of its divisors is an integer number (6152843361).

Almost surely, 2^12305686721 is an apocalyptic number.

It is an amenable number.

12305686721 is a deficient number, since it is larger than the sum of its proper divisors (1).

12305686721 is an equidigital number, since it uses as much as digits as its factorization.

12305686721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 41.

The spelling of 12305686721 in words is "twelve billion, three hundred five million, six hundred eighty-six thousand, seven hundred twenty-one".