13126380344821 has 2 divisors, whose sum is σ = 13126380344822. Its totient is φ = 13126380344820.

The previous prime is 13126380344741. The next prime is 13126380344851. The reversal of 13126380344821 is 12844308362131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13016119821796 + 110260523025 = 3607786^2 + 332055^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13126380344821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13126380344851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6563190172410 + 6563190172411.

It is an arithmetic number, because the mean of its divisors is an integer number (6563190172411).

Almost surely, 2^{13126380344821} is an apocalyptic number.

It is an amenable number.

13126380344821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13126380344821 is an equidigital number, since it uses as much as digits as its factorization.

13126380344821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 13126380344821 in words is "thirteen trillion, one hundred twenty-six billion, three hundred eighty million, three hundred forty-four thousand, eight hundred twenty-one".