200189021 has 2 divisors, whose sum is σ = 200189022. Its totient is φ = 200189020.

The previous prime is 200188999. The next prime is 200189053. The reversal of 200189021 is 120981002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 196308121 + 3880900 = 14011^2 + 1970^2 .

It is a cyclic number.

It is not a de Polignac number, because 200189021 - 2¹⁸ = 199926877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200183021) 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, 100094510 + 100094511.

It is an arithmetic number, because the mean of its divisors is an integer number (100094511).

Almost surely, 2^200189021 is an apocalyptic number.

It is an amenable number.

200189021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200189021 is an equidigital number, since it uses as much as digits as its factorization.

200189021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 200189021 is about 14148.8169470101. The cubic root of 200189021 is about 584.9877232186.

The spelling of 200189021 in words is "two hundred million, one hundred eighty-nine thousand, twenty-one".