200022821 has 2 divisors, whose sum is σ = 200022822. Its totient is φ = 200022820.

The previous prime is 200022817. The next prime is 200022839. The reversal of 200022821 is 128220002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199120321 + 902500 = 14111^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 200022821 - 2² = 200022817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 200022821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (200025821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100011410 + 100011411.

It is an arithmetic number, because the mean of its divisors is an integer number (100011411).

Almost surely, 2^200022821 is an apocalyptic number.

It is an amenable number.

200022821 is a deficient number, since it is larger than the sum of its proper divisors (1).

200022821 is an equidigital number, since it uses as much as digits as its factorization.

200022821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 200022821 is about 14142.9424449087. The cubic root of 200022821 is about 584.8257897995.

Adding to 200022821 its reverse (128220002), we get a palindrome (328242823).

The spelling of 200022821 in words is "two hundred million, twenty-two thousand, eight hundred twenty-one".