13221696187 has 4 divisors (see below), whose sum is σ = 15110509936. Its totient is φ = 11332882440.

The previous prime is 13221696181. The next prime is 13221696221. The reversal of 13221696187 is 78169612231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 13221696187 - 2³ = 13221696179 is a prime.

It is a super-2 number, since 2×13221696187² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13221696181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944406864 + ... + 944406877.

It is an arithmetic number, because the mean of its divisors is an integer number (3777627484).

Almost surely, 2^13221696187 is an apocalyptic number.

13221696187 is a deficient number, since it is larger than the sum of its proper divisors (1888813749).

13221696187 is an equidigital number, since it uses as much as digits as its factorization.

13221696187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888813748.

The product of its digits is 217728, while the sum is 46.

The spelling of 13221696187 in words is "thirteen billion, two hundred twenty-one million, six hundred ninety-six thousand, one hundred eighty-seven".