13205221 has 4 divisors (see below), whose sum is σ = 13219200. Its totient is φ = 13191244.

The previous prime is 13205207. The next prime is 13205249. The reversal of 13205221 is 12250231.

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 13205221 - 2¹⁹ = 12680933 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13205195 and 13205204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13205251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5461 + ... + 7498.

It is an arithmetic number, because the mean of its divisors is an integer number (3304800).

Almost surely, 2^13205221 is an apocalyptic number.

It is an amenable number.

13205221 is a deficient number, since it is larger than the sum of its proper divisors (13979).

13205221 is a wasteful number, since it uses less digits than its factorization.

13205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13978.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 13205221 is about 3633.8988703595. The cubic root of 13205221 is about 236.3643049605.

Adding to 13205221 its reverse (12250231), we get a palindrome (25455452).

The spelling of 13205221 in words is "thirteen million, two hundred five thousand, two hundred twenty-one".