200005121 has 2 divisors, whose sum is σ = 200005122. Its totient is φ = 200005120.

The previous prime is 200005111. The next prime is 200005129. The reversal of 200005121 is 121500002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 78145600 = 11039^2 + 8840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200005121 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (200005129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100002560 + 100002561.

It is an arithmetic number, because the mean of its divisors is an integer number (100002561).

Almost surely, 2^200005121 is an apocalyptic number.

It is an amenable number.

200005121 is a deficient number, since it is larger than the sum of its proper divisors (1).

200005121 is an equidigital number, since it uses as much as digits as its factorization.

200005121 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 11.

The square root of 200005121 is about 14142.3166772633. The cubic root of 200005121 is about 584.8085388983.

Adding to 200005121 its reverse (121500002), we get a palindrome (321505123).

The spelling of 200005121 in words is "two hundred million, five thousand, one hundred twenty-one".