12306393678221 has 2 divisors, whose sum is σ = 12306393678222. Its totient is φ = 12306393678220.

The previous prime is 12306393678191. The next prime is 12306393678269. The reversal of 12306393678221 is 12287639360321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9077234994025 + 3229158684196 = 3012845^2 + 1796986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12306393678221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12306393678281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6153196839110 + 6153196839111.

It is an arithmetic number, because the mean of its divisors is an integer number (6153196839111).

Almost surely, 2^{12306393678221} is an apocalyptic number.

It is an amenable number.

12306393678221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12306393678221 is an equidigital number, since it uses as much as digits as its factorization.

12306393678221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3919104, while the sum is 53.

The spelling of 12306393678221 in words is "twelve trillion, three hundred six billion, three hundred ninety-three million, six hundred seventy-eight thousand, two hundred twenty-one".