200008021 has 2 divisors, whose sum is σ = 200008022. Its totient is φ = 200008020.

The previous prime is 200008019. The next prime is 200008033. The reversal of 200008021 is 120800002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154107396 + 45900625 = 12414^2 + 6775^2 .

It is a cyclic number.

It is not a de Polignac number, because 200008021 - 2¹ = 200008019 is a prime.

Together with 200008019, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 200007992 and 200008010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200008091) 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, 100004010 + 100004011.

It is an arithmetic number, because the mean of its divisors is an integer number (100004011).

Almost surely, 2^200008021 is an apocalyptic number.

It is an amenable number.

200008021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200008021 is an equidigital number, since it uses as much as digits as its factorization.

200008021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 200008021 is about 14142.4192060623. The cubic root of 200008021 is about 584.8113653868.

Adding to 200008021 its reverse (120800002), we get a palindrome (320808023).

The spelling of 200008021 in words is "two hundred million, eight thousand, twenty-one".