13560221 has 2 divisors, whose sum is σ = 13560222. Its totient is φ = 13560220.

The previous prime is 13560199. The next prime is 13560223. The reversal of 13560221 is 12206531.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8916196 + 4644025 = 2986^2 + 2155^2 .

It is a cyclic number.

It is not a de Polignac number, because 13560221 - 2¹⁰ = 13559197 is a prime.

Together with 13560223, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13560193 and 13560202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13560223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6780110 + 6780111.

It is an arithmetic number, because the mean of its divisors is an integer number (6780111).

Almost surely, 2^13560221 is an apocalyptic number.

It is an amenable number.

13560221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13560221 is an equidigital number, since it uses as much as digits as its factorization.

13560221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 13560221 is about 3682.4205354631. The cubic root of 13560221 is about 238.4636877444.

Adding to 13560221 its reverse (12206531), we get a palindrome (25766752).

The spelling of 13560221 in words is "thirteen million, five hundred sixty thousand, two hundred twenty-one".