13221365 has 8 divisors (see below), whose sum is σ = 15928920. Its totient is φ = 10534912.

The previous prime is 13221353. The next prime is 13221379. The reversal of 13221365 is 56312231.

It can be written as a sum of positive squares in 4 ways, for example, as 7806436 + 5414929 = 2794^2 + 2327^2 .

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 13221365 - 2⁴ = 13221349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13221365.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3860 + ... + 6429.

It is an arithmetic number, because the mean of its divisors is an integer number (1991115).

Almost surely, 2^13221365 is an apocalyptic number.

It is an amenable number.

13221365 is a deficient number, since it is larger than the sum of its proper divisors (2707555).

13221365 is a wasteful number, since it uses less digits than its factorization.

13221365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10551.

The product of its digits is 1080, while the sum is 23.

The square root of 13221365 is about 3636.1194974863. The cubic root of 13221365 is about 236.4605878718.

Adding to 13221365 its reverse (56312231), we get a palindrome (69533596).

The spelling of 13221365 in words is "thirteen million, two hundred twenty-one thousand, three hundred sixty-five".