13218371 has 2 divisors, whose sum is σ = 13218372. Its totient is φ = 13218370.

The previous prime is 13218349. The next prime is 13218379. The reversal of 13218371 is 17381231.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13218371 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13218371.

It is not a weakly prime, because it can be changed into another prime (13218379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6609185 + 6609186.

It is an arithmetic number, because the mean of its divisors is an integer number (6609186).

Almost surely, 2^13218371 is an apocalyptic number.

13218371 is a deficient number, since it is larger than the sum of its proper divisors (1).

13218371 is an equidigital number, since it uses as much as digits as its factorization.

13218371 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 26.

The square root of 13218371 is about 3635.7077715350. The cubic root of 13218371 is about 236.4427375605.

The spelling of 13218371 in words is "thirteen million, two hundred eighteen thousand, three hundred seventy-one".