200220021 has 6 divisors (see below), whose sum is σ = 289206710. Its totient is φ = 133480008.

The previous prime is 200220017. The next prime is 200220023. The reversal of 200220021 is 120022002.

It can be written as a sum of positive squares in only one way, i.e., 127373796 + 72846225 = 11286^2 + 8535^2 .

It is not a de Polignac number, because 200220021 - 2² = 200220017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 22246669 = 200220021 / (2 + 0 + 0 + 2 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 200219985 and 200220012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200220023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11123326 + ... + 11123343.

Almost surely, 2^200220021 is an apocalyptic number.

It is an amenable number.

200220021 is a deficient number, since it is larger than the sum of its proper divisors (88986689).

200220021 is a wasteful number, since it uses less digits than its factorization.

200220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22246675 (or 22246672 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 200220021 is about 14149.9124025557. The cubic root of 200220021 is about 585.0179174876.

Adding to 200220021 its reverse (120022002), we get a palindrome (320242023).

The spelling of 200220021 in words is "two hundred million, two hundred twenty thousand, twenty-one".