2808670021 has 2 divisors, whose sum is σ = 2808670022. Its totient is φ = 2808670020.

The previous prime is 2808670019. The next prime is 2808670061. The reversal of 2808670021 is 1200768082.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2804867521 + 3802500 = 52961^2 + 1950^2 .

It is a cyclic number.

It is not a de Polignac number, because 2808670021 - 2¹ = 2808670019 is a prime.

Together with 2808670019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2808670061) 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, 1404335010 + 1404335011.

It is an arithmetic number, because the mean of its divisors is an integer number (1404335011).

Almost surely, 2^2808670021 is an apocalyptic number.

It is an amenable number.

2808670021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2808670021 is an equidigital number, since it uses as much as digits as its factorization.

2808670021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 2808670021 is about 52996.8868991378. The cubic root of 2808670021 is about 1410.9130147926.

The spelling of 2808670021 in words is "two billion, eight hundred eight million, six hundred seventy thousand, twenty-one".