12794171821 has 2 divisors, whose sum is σ = 12794171822. Its totient is φ = 12794171820.

The previous prime is 12794171749. The next prime is 12794171827. The reversal of 12794171821 is 12817149721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8351949321 + 4442222500 = 91389^2 + 66650^2 .

It is an emirp because it is prime and its reverse (12817149721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12794171821 - 2²⁷ = 12659954093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12794171827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6397085910 + 6397085911.

It is an arithmetic number, because the mean of its divisors is an integer number (6397085911).

Almost surely, 2^12794171821 is an apocalyptic number.

It is an amenable number.

12794171821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12794171821 is an equidigital number, since it uses as much as digits as its factorization.

12794171821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 43.

The spelling of 12794171821 in words is "twelve billion, seven hundred ninety-four million, one hundred seventy-one thousand, eight hundred twenty-one".