13218189891 has 8 divisors (see below), whose sum is σ = 17649397584. Its totient is φ = 8799554400.

The previous prime is 13218189889. The next prime is 13218189931. The reversal of 13218189891 is 19898181231.

13218189891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13218189891 - 2¹ = 13218189889 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (13218189091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3140596 + ... + 3144801.

It is an arithmetic number, because the mean of its divisors is an integer number (2206174698).

Almost surely, 2^13218189891 is an apocalyptic number.

13218189891 is a deficient number, since it is larger than the sum of its proper divisors (4431207693).

13218189891 is an equidigital number, since it uses as much as digits as its factorization.

13218189891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6286101.

The product of its digits is 248832, while the sum is 51.

The spelling of 13218189891 in words is "thirteen billion, two hundred eighteen million, one hundred eighty-nine thousand, eight hundred ninety-one".