13242221 has 16 divisors (see below), whose sum is σ = 14515200. Its totient is φ = 12038400.

The previous prime is 13242199. The next prime is 13242253. The reversal of 13242221 is 12224231.

It is not a de Polignac number, because 13242221 - 2⁶ = 13242157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 13242221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13242121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69236 + ... + 69426.

It is an arithmetic number, because the mean of its divisors is an integer number (907200).

Almost surely, 2^13242221 is an apocalyptic number.

It is an amenable number.

13242221 is a deficient number, since it is larger than the sum of its proper divisors (1272979).

13242221 is a wasteful number, since it uses less digits than its factorization.

13242221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its digits is 192, while the sum is 17.

The square root of 13242221 is about 3638.9862599356. The cubic root of 13242221 is about 236.5848572184.

Adding to 13242221 its reverse (12224231), we get a palindrome (25466452).

The spelling of 13242221 in words is "thirteen million, two hundred forty-two thousand, two hundred twenty-one".