200005000021 has 2 divisors, whose sum is σ = 200005000022. Its totient is φ = 200005000020.

The previous prime is 200004999937. The next prime is 200005000057. The reversal of 200005000021 is 120000500002.

200005000021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182658792996 + 17346207025 = 427386^2 + 131705^2 .

It is a cyclic number.

It is not a de Polignac number, because 200005000021 - 2⁷ = 200004999893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200004999971 and 200005000007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200005000061) 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, 100002500010 + 100002500011.

It is an arithmetic number, because the mean of its divisors is an integer number (100002500011).

Almost surely, 2^200005000021 is an apocalyptic number.

It is an amenable number.

200005000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200005000021 is an equidigital number, since it uses as much as digits as its factorization.

200005000021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20, while the sum is 10.

Adding to 200005000021 its reverse (120000500002), we get a palindrome (320005500023).

The spelling of 200005000021 in words is "two hundred billion, five million, twenty-one", and thus it is an aban number.