13409321 has 2 divisors, whose sum is σ = 13409322. Its totient is φ = 13409320.

The previous prime is 13409309. The next prime is 13409323. The reversal of 13409321 is 12390431.

13409321 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13402921 + 6400 = 3661^2 + 80^2 .

It is a cyclic number.

It is not a de Polignac number, because 13409321 - 2¹⁸ = 13147177 is a prime.

It is a super-3 number, since 3×13409321³ (a number of 22 digits) contains 333 as substring.

Together with 13409323, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13409323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6704660 + 6704661.

It is an arithmetic number, because the mean of its divisors is an integer number (6704661).

Almost surely, 2^13409321 is an apocalyptic number.

It is an amenable number.

13409321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13409321 is an equidigital number, since it uses as much as digits as its factorization.

13409321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 13409321 is about 3661.8739738008. The cubic root of 13409321 is about 237.5758339553.

Adding to 13409321 its reverse (12390431), we get a palindrome (25799752).

The spelling of 13409321 in words is "thirteen million, four hundred nine thousand, three hundred twenty-one".