13568965217221 has 2 divisors, whose sum is σ = 13568965217222. Its totient is φ = 13568965217220.

The previous prime is 13568965217209. The next prime is 13568965217233. The reversal of 13568965217221 is 12271256986531.

It is a balanced prime because it is at equal distance from previous prime (13568965217209) and next prime (13568965217233).

It can be written as a sum of positive squares in only one way, i.e., 8558485889121 + 5010479328100 = 2925489^2 + 2238410^2 .

It is a cyclic number.

It is not a de Polignac number, because 13568965217221 - 2²³ = 13568956828613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13568965217921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6784482608610 + 6784482608611.

It is an arithmetic number, because the mean of its divisors is an integer number (6784482608611).

Almost surely, 2^{13568965217221} is an apocalyptic number.

It is an amenable number.

13568965217221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13568965217221 is an equidigital number, since it uses as much as digits as its factorization.

13568965217221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10886400, while the sum is 58.

The spelling of 13568965217221 in words is "thirteen trillion, five hundred sixty-eight billion, nine hundred sixty-five million, two hundred seventeen thousand, two hundred twenty-one".