16368927821 has 2 divisors, whose sum is σ = 16368927822. Its totient is φ = 16368927820.

The previous prime is 16368927811. The next prime is 16368927829. The reversal of 16368927821 is 12872986361.

16368927821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12879072196 + 3489855625 = 113486^2 + 59075^2 .

It is an emirp because it is prime and its reverse (12872986361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16368927821 - 2²⁶ = 16301818957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16368927829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8184463910 + 8184463911.

It is an arithmetic number, because the mean of its divisors is an integer number (8184463911).

Almost surely, 2^16368927821 is an apocalyptic number.

It is an amenable number.

16368927821 is a deficient number, since it is larger than the sum of its proper divisors (1).

16368927821 is an equidigital number, since it uses as much as digits as its factorization.

16368927821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 16368927821 in words is "sixteen billion, three hundred sixty-eight million, nine hundred twenty-seven thousand, eight hundred twenty-one".