13281827818121 has 2 divisors, whose sum is σ = 13281827818122. Its totient is φ = 13281827818120.

The previous prime is 13281827818099. The next prime is 13281827818153. The reversal of 13281827818121 is 12181872818231.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7988197795600 + 5293630022521 = 2826340^2 + 2300789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13281827818121 is a prime.

It is not a weakly prime, because it can be changed into another prime (13281827817121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6640913909060 + 6640913909061.

It is an arithmetic number, because the mean of its divisors is an integer number (6640913909061).

Almost surely, 2^{13281827818121} is an apocalyptic number.

It is an amenable number.

13281827818121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13281827818121 is an equidigital number, since it uses as much as digits as its factorization.

13281827818121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 688128, while the sum is 53.

The spelling of 13281827818121 in words is "thirteen trillion, two hundred eighty-one billion, eight hundred twenty-seven million, eight hundred eighteen thousand, one hundred twenty-one".