13221811718 has 16 divisors (see below), whose sum is σ = 20520146880. Its totient is φ = 6381841536.

The previous prime is 13221811697. The next prime is 13221811723. The reversal of 13221811718 is 81711812231.

It is a super-2 number, since 2×13221811718² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 393155 + ... + 425457.

It is an arithmetic number, because the mean of its divisors is an integer number (1282509180).

Almost surely, 2^13221811718 is an apocalyptic number.

13221811718 is a deficient number, since it is larger than the sum of its proper divisors (7298335162).

13221811718 is a wasteful number, since it uses less digits than its factorization.

13221811718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39391.

The product of its digits is 5376, while the sum is 35.

The spelling of 13221811718 in words is "thirteen billion, two hundred twenty-one million, eight hundred eleven thousand, seven hundred eighteen".