13420321 has 2 divisors, whose sum is σ = 13420322. Its totient is φ = 13420320.

The previous prime is 13420291. The next prime is 13420331. The reversal of 13420321 is 12302431.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 739600 = 3561^2 + 860^2 .

It is an emirp because it is prime and its reverse (12302431) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13420321 - 2⁷ = 13420193 is a prime.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 13420295 and 13420304.

It is not a weakly prime, because it can be changed into another prime (13420331) 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, 6710160 + 6710161.

It is an arithmetic number, because the mean of its divisors is an integer number (6710161).

Almost surely, 2^13420321 is an apocalyptic number.

It is an amenable number.

13420321 is a deficient number, since it is larger than the sum of its proper divisors (1).

13420321 is an equidigital number, since it uses as much as digits as its factorization.

13420321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 13420321 is about 3663.3756291159. The cubic root of 13420321 is about 237.6407793244.

Adding to 13420321 its reverse (12302431), we get a palindrome (25722752).

The spelling of 13420321 in words is "thirteen million, four hundred twenty thousand, three hundred twenty-one".