13213331321 has 2 divisors, whose sum is σ = 13213331322. Its totient is φ = 13213331320.

The previous prime is 13213331297. The next prime is 13213331353. The reversal of 13213331321 is 12313331231.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11209515625 + 2003815696 = 105875^2 + 44764^2 .

It is an emirp because it is prime and its reverse (12313331231) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13213331321 is a prime.

It is not a weakly prime, because it can be changed into another prime (13213331381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6606665660 + 6606665661.

It is an arithmetic number, because the mean of its divisors is an integer number (6606665661).

Almost surely, 2^13213331321 is an apocalyptic number.

It is an amenable number.

13213331321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13213331321 is an equidigital number, since it uses as much as digits as its factorization.

13213331321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972, while the sum is 23.

Adding to 13213331321 its reverse (12313331231), we get a palindrome (25526662552).

The spelling of 13213331321 in words is "thirteen billion, two hundred thirteen million, three hundred thirty-one thousand, three hundred twenty-one".