13221237 has 8 divisors (see below), whose sum is σ = 17667936. Its totient is φ = 8794352.

The previous prime is 13221233. The next prime is 13221269. The reversal of 13221237 is 73212231.

13221237 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 13221237 - 2² = 13221233 is a prime.

It is a super-2 number, since 2×13221237² = 349602215620338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13221233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3318 + ... + 6119.

It is an arithmetic number, because the mean of its divisors is an integer number (2208492).

Almost surely, 2^13221237 is an apocalyptic number.

It is an amenable number.

13221237 is a deficient number, since it is larger than the sum of its proper divisors (4446699).

13221237 is an equidigital number, since it uses as much as digits as its factorization.

13221237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9907.

The product of its digits is 504, while the sum is 21.

The square root of 13221237 is about 3636.1018962620. The cubic root of 13221237 is about 236.4598247874.

Adding to 13221237 its reverse (73212231), we get a palindrome (86433468).

The spelling of 13221237 in words is "thirteen million, two hundred twenty-one thousand, two hundred thirty-seven".