13221812068 has 6 divisors (see below), whose sum is σ = 23138171126. Its totient is φ = 6610906032.

The previous prime is 13221812063. The next prime is 13221812069. The reversal of 13221812068 is 86021812231.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11905428544 + 1316383524 = 109112^2 + 36282^2 .

It is not an unprimeable number, because it can be changed into a prime (13221812063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1652726505 + ... + 1652726512.

Almost surely, 2^13221812068 is an apocalyptic number.

It is an amenable number.

13221812068 is a deficient number, since it is larger than the sum of its proper divisors (9916359058).

13221812068 is a wasteful number, since it uses less digits than its factorization.

13221812068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3305453021 (or 3305453019 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 13221812068 in words is "thirteen billion, two hundred twenty-one million, eight hundred twelve thousand, sixty-eight".