200218021 has 2 divisors, whose sum is σ = 200218022. Its totient is φ = 200218020.

The previous prime is 200218003. The next prime is 200218087. The reversal of 200218021 is 120812002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 166693921 + 33524100 = 12911^2 + 5790^2 .

It is a cyclic number.

It is not a de Polignac number, because 200218021 - 2¹¹ = 200215973 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 200217986 and 200218004.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200218321) 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, 100109010 + 100109011.

It is an arithmetic number, because the mean of its divisors is an integer number (100109011).

Almost surely, 2^200218021 is an apocalyptic number.

It is an amenable number.

200218021 is a deficient number, since it is larger than the sum of its proper divisors (1).

200218021 is an equidigital number, since it uses as much as digits as its factorization.

200218021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 200218021 is about 14149.8417305636. The cubic root of 200218021 is about 585.0159695643.

The spelling of 200218021 in words is "two hundred million, two hundred eighteen thousand, twenty-one".