200121200161 has 2 divisors, whose sum is σ = 200121200162. Its totient is φ = 200121200160.

The previous prime is 200121200159. The next prime is 200121200207. The reversal of 200121200161 is 161002121002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179389519936 + 20731680225 = 423544^2 + 143985^2 .

It is a cyclic number.

It is not a de Polignac number, because 200121200161 - 2¹ = 200121200159 is a prime.

Together with 200121200159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (200121207161) 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, 100060600080 + 100060600081.

It is an arithmetic number, because the mean of its divisors is an integer number (100060600081).

Almost surely, 2^200121200161 is an apocalyptic number.

It is an amenable number.

200121200161 is a deficient number, since it is larger than the sum of its proper divisors (1).

200121200161 is an equidigital number, since it uses as much as digits as its factorization.

200121200161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 200121200161 its reverse (161002121002), we get a palindrome (361123321163).

The spelling of 200121200161 in words is "two hundred billion, one hundred twenty-one million, two hundred thousand, one hundred sixty-one".