200021953 has 2 divisors, whose sum is σ = 200021954. Its totient is φ = 200021952.

The previous prime is 200021933. The next prime is 200022029. The reversal of 200021953 is 359120002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193432464 + 6589489 = 13908^2 + 2567^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-200021953 is a prime.

It is not a weakly prime, because it can be changed into another prime (200021933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100010976 + 100010977.

It is an arithmetic number, because the mean of its divisors is an integer number (100010977).

Almost surely, 2^200021953 is an apocalyptic number.

It is an amenable number.

200021953 is a deficient number, since it is larger than the sum of its proper divisors (1).

200021953 is an equidigital number, since it uses as much as digits as its factorization.

200021953 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 200021953 is about 14142.9117581918. The cubic root of 200021953 is about 584.8249438469.

Adding to 200021953 its reverse (359120002), we get a palindrome (559141955).

The spelling of 200021953 in words is "two hundred million, twenty-one thousand, nine hundred fifty-three".