13218973243193 has 2 divisors, whose sum is σ = 13218973243194. Its totient is φ = 13218973243192.

The previous prime is 13218973243183. The next prime is 13218973243271. The reversal of 13218973243193 is 39134237981231.

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., 13105790116864 + 113183126329 = 3620192^2 + 336427^2 .

It is a cyclic number.

It is not a de Polignac number, because 13218973243193 - 2¹⁰ = 13218973242169 is a prime.

It is not a weakly prime, because it can be changed into another prime (13218973243123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6609486621596 + 6609486621597.

It is an arithmetic number, because the mean of its divisors is an integer number (6609486621597).

Almost surely, 2^{13218973243193} is an apocalyptic number.

It is an amenable number.

13218973243193 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218973243193 is an equidigital number, since it uses as much as digits as its factorization.

13218973243193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 56.

The spelling of 13218973243193 in words is "thirteen trillion, two hundred eighteen billion, nine hundred seventy-three million, two hundred forty-three thousand, one hundred ninety-three".