200021243 has 2 divisors, whose sum is σ = 200021244. Its totient is φ = 200021242.

The previous prime is 200021219. The next prime is 200021249. The reversal of 200021243 is 342120002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 200021243 - 2¹⁸ = 199759099 is a prime.

It is not a weakly prime, because it can be changed into another prime (200021249) 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, 100010621 + 100010622.

It is an arithmetic number, because the mean of its divisors is an integer number (100010622).

Almost surely, 2^200021243 is an apocalyptic number.

200021243 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021243 is an equidigital number, since it uses as much as digits as its factorization.

200021243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 200021243 is about 14142.8866572564. The cubic root of 200021243 is about 584.8242518792.

Adding to 200021243 its reverse (342120002), we get a palindrome (542141245).

The spelling of 200021243 in words is "two hundred million, twenty-one thousand, two hundred forty-three".