12771868598821 has 2 divisors, whose sum is σ = 12771868598822. Its totient is φ = 12771868598820.

The previous prime is 12771868598809. The next prime is 12771868598851. The reversal of 12771868598821 is 12889586817721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7597217253025 + 5174651345796 = 2756305^2 + 2274786^2 .

It is a cyclic number.

It is not a de Polignac number, because 12771868598821 - 2¹⁹ = 12771868074533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12771868598851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385934299410 + 6385934299411.

It is an arithmetic number, because the mean of its divisors is an integer number (6385934299411).

Almost surely, 2^{12771868598821} is an apocalyptic number.

It is an amenable number.

12771868598821 is a deficient number, since it is larger than the sum of its proper divisors (1).

12771868598821 is an equidigital number, since it uses as much as digits as its factorization.

12771868598821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 216760320, while the sum is 73.

The spelling of 12771868598821 in words is "twelve trillion, seven hundred seventy-one billion, eight hundred sixty-eight million, five hundred ninety-eight thousand, eight hundred twenty-one".