27808315321 has 2 divisors, whose sum is σ = 27808315322. Its totient is φ = 27808315320.

The previous prime is 27808315307. The next prime is 27808315333. The reversal of 27808315321 is 12351380872.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18353475625 + 9454839696 = 135475^2 + 97236^2 .

It is a cyclic number.

It is not a de Polignac number, because 27808315321 - 2¹⁵ = 27808282553 is a prime.

It is not a weakly prime, because it can be changed into another prime (27808315021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13904157660 + 13904157661.

It is an arithmetic number, because the mean of its divisors is an integer number (13904157661).

Almost surely, 2^27808315321 is an apocalyptic number.

It is an amenable number.

27808315321 is a deficient number, since it is larger than the sum of its proper divisors (1).

27808315321 is an equidigital number, since it uses as much as digits as its factorization.

27808315321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 40.

The spelling of 27808315321 in words is "twenty-seven billion, eight hundred eight million, three hundred fifteen thousand, three hundred twenty-one".