13568221 has 2 divisors, whose sum is σ = 13568222. Its totient is φ = 13568220.

The previous prime is 13568213. The next prime is 13568231. The reversal of 13568221 is 12286531.

13568221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10725625 + 2842596 = 3275^2 + 1686^2 .

It is a cyclic number.

It is not a de Polignac number, because 13568221 - 2³ = 13568213 is a prime.

It is a super-2 number, since 2×13568221² = 368193242209682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13568221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13568231) 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 as a sum of consecutive naturals, namely, 6784110 + 6784111.

It is an arithmetic number, because the mean of its divisors is an integer number (6784111).

Almost surely, 2^13568221 is an apocalyptic number.

It is an amenable number.

13568221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13568221 is an equidigital number, since it uses as much as digits as its factorization.

13568221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 28.

The square root of 13568221 is about 3683.5066173417. The cubic root of 13568221 is about 238.5105732750.

The spelling of 13568221 in words is "thirteen million, five hundred sixty-eight thousand, two hundred twenty-one".