200121193 has 2 divisors, whose sum is σ = 200121194. Its totient is φ = 200121192.

The previous prime is 200121191. The next prime is 200121203. The reversal of 200121193 is 391121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194128489 + 5992704 = 13933^2 + 2448^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121193 - 2¹ = 200121191 is a prime.

Together with 200121191, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 200121193.

It is not a weakly prime, because it can be changed into another prime (200121191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100060596 + 100060597.

It is an arithmetic number, because the mean of its divisors is an integer number (100060597).

Almost surely, 2^200121193 is an apocalyptic number.

It is an amenable number.

200121193 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121193 is an equidigital number, since it uses as much as digits as its factorization.

200121193 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108, while the sum is 19.

The square root of 200121193 is about 14146.4197944215. The cubic root of 200121193 is about 584.9216472850.

Adding to 200121193 its reverse (391121002), we get a palindrome (591242195).

The spelling of 200121193 in words is "two hundred million, one hundred twenty-one thousand, one hundred ninety-three".