13221811691 has 12 divisors (see below), whose sum is σ = 14749986216. Its totient is φ = 11840421120.

The previous prime is 13221811663. The next prime is 13221811697. The reversal of 13221811691 is 19611812231.

It is a happy number.

13221811691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-13221811691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13221811697) 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 11 ways as a sum of consecutive naturals, for example, 807350 + ... + 823563.

It is an arithmetic number, because the mean of its divisors is an integer number (1229165518).

Almost surely, 2^13221811691 is an apocalyptic number.

13221811691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13221811691 is a deficient number, since it is larger than the sum of its proper divisors (1528174525).

13221811691 is a wasteful number, since it uses less digits than its factorization.

13221811691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1631002 (or 1630991 counting only the distinct ones).

The product of its digits is 5184, while the sum is 35.

The spelling of 13221811691 in words is "thirteen billion, two hundred twenty-one million, eight hundred eleven thousand, six hundred ninety-one".