21680081307133 has 2 divisors, whose sum is σ = 21680081307134. Its totient is φ = 21680081307132.

The previous prime is 21680081307121. The next prime is 21680081307221. The reversal of 21680081307133 is 33170318008612.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20984855531929 + 695225775204 = 4580923^2 + 833802^2 .

It is a cyclic number.

It is not a de Polignac number, because 21680081307133 - 2²¹ = 21680079209981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21680081307133.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21680081307103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10840040653566 + 10840040653567.

It is an arithmetic number, because the mean of its divisors is an integer number (10840040653567).

Almost surely, 2^{21680081307133} is an apocalyptic number.

It is an amenable number.

21680081307133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21680081307133 is an equidigital number, since it uses as much as digits as its factorization.

21680081307133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 43.

The spelling of 21680081307133 in words is "twenty-one trillion, six hundred eighty billion, eighty-one million, three hundred seven thousand, one hundred thirty-three".