200660021 has 4 divisors (see below), whose sum is σ = 200690412. Its totient is φ = 200629632.

The previous prime is 200660011. The next prime is 200660051. The reversal of 200660021 is 120066002.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104325796 + 96334225 = 10214^2 + 9815^2 .

It is a cyclic number.

It is not a de Polignac number, because 200660021 - 2⁶ = 200659957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (200660011) 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 in 3 ways as a sum of consecutive naturals, for example, 650 + ... + 20043.

It is an arithmetic number, because the mean of its divisors is an integer number (50172603).

Almost surely, 2^200660021 is an apocalyptic number.

It is an amenable number.

200660021 is a deficient number, since it is larger than the sum of its proper divisors (30391).

200660021 is an equidigital number, since it uses as much as digits as its factorization.

200660021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30390.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 200660021 is about 14165.4516694668. The cubic root of 200660021 is about 585.4461456503.

The spelling of 200660021 in words is "two hundred million, six hundred sixty thousand, twenty-one".