13568280821 has 2 divisors, whose sum is σ = 13568280822. Its totient is φ = 13568280820.

The previous prime is 13568280793. The next prime is 13568280863. The reversal of 13568280821 is 12808286531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13543140625 + 25140196 = 116375^2 + 5014^2 .

It is a cyclic number.

It is not a de Polignac number, because 13568280821 - 2¹⁰ = 13568279797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13568280521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6784140410 + 6784140411.

It is an arithmetic number, because the mean of its divisors is an integer number (6784140411).

Almost surely, 2^13568280821 is an apocalyptic number.

It is an amenable number.

13568280821 is a deficient number, since it is larger than the sum of its proper divisors (1).

13568280821 is an equidigital number, since it uses as much as digits as its factorization.

13568280821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 184320, while the sum is 44.

The spelling of 13568280821 in words is "thirteen billion, five hundred sixty-eight million, two hundred eighty thousand, eight hundred twenty-one".