13221137684 has 24 divisors (see below), whose sum is σ = 23641216200. Its totient is φ = 6467220864.

The previous prime is 13221137627. The next prime is 13221137687. The reversal of 13221137684 is 48673112231.

It can be written as a sum of positive squares in 4 ways, for example, as 7749280900 + 5471856784 = 88030^2 + 73972^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221137687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15359 + ... + 163334.

It is an arithmetic number, because the mean of its divisors is an integer number (985050675).

Almost surely, 2^13221137684 is an apocalyptic number.

It is an amenable number.

13221137684 is a deficient number, since it is larger than the sum of its proper divisors (10420078516).

13221137684 is a wasteful number, since it uses less digits than its factorization.

13221137684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179099 (or 179097 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The spelling of 13221137684 in words is "thirteen billion, two hundred twenty-one million, one hundred thirty-seven thousand, six hundred eighty-four".