13221243 has 12 divisors (see below), whose sum is σ = 21825648. Its totient is φ = 7554960.

The previous prime is 13221233. The next prime is 13221269. The reversal of 13221243 is 34212231.

It is not a de Polignac number, because 13221243 - 2⁴ = 13221227 is a prime.

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 11 ways as a sum of consecutive naturals, for example, 104868 + ... + 104993.

It is an arithmetic number, because the mean of its divisors is an integer number (1818804).

Almost surely, 2^13221243 is an apocalyptic number.

13221243 is a deficient number, since it is larger than the sum of its proper divisors (8604405).

13221243 is a wasteful number, since it uses less digits than its factorization.

13221243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209874 (or 209871 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 13221243 is about 3636.1027213213. The cubic root of 13221243 is about 236.4598605571.

Adding to 13221243 its reverse (34212231), we get a palindrome (47433474).

The spelling of 13221243 in words is "thirteen million, two hundred twenty-one thousand, two hundred forty-three".