3805982021 has 2 divisors, whose sum is σ = 3805982022. Its totient is φ = 3805982020.

The previous prime is 3805982009. The next prime is 3805982111. The reversal of 3805982021 is 1202895083.

3805982021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2850492100 + 955489921 = 53390^2 + 30911^2 .

It is a cyclic number.

It is not a de Polignac number, because 3805982021 - 2¹⁴ = 3805965637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3805985021) 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, 1902991010 + 1902991011.

It is an arithmetic number, because the mean of its divisors is an integer number (1902991011).

Almost surely, 2^3805982021 is an apocalyptic number.

It is an amenable number.

3805982021 is a deficient number, since it is larger than the sum of its proper divisors (1).

3805982021 is an equidigital number, since it uses as much as digits as its factorization.

3805982021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 3805982021 is about 61692.6415466221. The cubic root of 3805982021 is about 1561.3091712643.

The spelling of 3805982021 in words is "three billion, eight hundred five million, nine hundred eighty-two thousand, twenty-one".