13424221 has 2 divisors, whose sum is σ = 13424222. Its totient is φ = 13424220.

The previous prime is 13424161. The next prime is 13424231. The reversal of 13424221 is 12242431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7901721 + 5522500 = 2811^2 + 2350^2 .

It is a cyclic number.

It is not a de Polignac number, because 13424221 - 2¹⁵ = 13391453 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13424231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6712110 + 6712111.

It is an arithmetic number, because the mean of its divisors is an integer number (6712111).

Almost surely, 2^13424221 is an apocalyptic number.

It is an amenable number.

13424221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13424221 is an equidigital number, since it uses as much as digits as its factorization.

13424221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 13424221 is about 3663.9078863967. The cubic root of 13424221 is about 237.6637968880.

Adding to 13424221 its reverse (12242431), we get a palindrome (25666652).

The spelling of 13424221 in words is "thirteen million, four hundred twenty-four thousand, two hundred twenty-one".