12794666221 has 2 divisors, whose sum is σ = 12794666222. Its totient is φ = 12794666220.

The previous prime is 12794666219. The next prime is 12794666303. The reversal of 12794666221 is 12266649721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11079878121 + 1714788100 = 105261^2 + 41410^2 .

It is an emirp because it is prime and its reverse (12266649721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12794666221 - 2¹ = 12794666219 is a prime.

Together with 12794666219, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12794666201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6397333110 + 6397333111.

It is an arithmetic number, because the mean of its divisors is an integer number (6397333111).

Almost surely, 2^12794666221 is an apocalyptic number.

It is an amenable number.

12794666221 is a deficient number, since it is larger than the sum of its proper divisors (1).

12794666221 is an equidigital number, since it uses as much as digits as its factorization.

12794666221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 435456, while the sum is 46.

The spelling of 12794666221 in words is "twelve billion, seven hundred ninety-four million, six hundred sixty-six thousand, two hundred twenty-one".