13221161 has 4 divisors (see below), whose sum is σ = 13279632. Its totient is φ = 13162692.

The previous prime is 13221151. The next prime is 13221191. The reversal of 13221161 is 16112231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13221161 - 2¹⁴ = 13204777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13221101) 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 3 ways as a sum of consecutive naturals, for example, 28895 + ... + 29348.

It is an arithmetic number, because the mean of its divisors is an integer number (3319908).

Almost surely, 2^13221161 is an apocalyptic number.

It is an amenable number.

13221161 is a deficient number, since it is larger than the sum of its proper divisors (58471).

13221161 is an equidigital number, since it uses as much as digits as its factorization.

13221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58470.

The product of its digits is 72, while the sum is 17.

The square root of 13221161 is about 3636.0914454947. The cubic root of 13221161 is about 236.4593717037.

Adding to 13221161 its reverse (16112231), we get a palindrome (29333392).

The spelling of 13221161 in words is "thirteen million, two hundred twenty-one thousand, one hundred sixty-one".