211200200021 has 4 divisors (see below), whose sum is σ = 214662498444. Its totient is φ = 207737901600.

The previous prime is 211200199967. The next prime is 211200200033. The reversal of 211200200021 is 120002002112.

It is a happy number.

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 84731059396 + 126469140625 = 291086^2 + 355625^2 .

It is a cyclic number.

It is not a de Polignac number, because 211200200021 - 2¹⁰ = 211200198997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211200199975 and 211200200011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211200200221) 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, 1731149120 + ... + 1731149241.

It is an arithmetic number, because the mean of its divisors is an integer number (53665624611).

Almost surely, 2^211200200021 is an apocalyptic number.

It is an amenable number.

211200200021 is a deficient number, since it is larger than the sum of its proper divisors (3462298423).

211200200021 is an equidigital number, since it uses as much as digits as its factorization.

211200200021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3462298422.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 211200200021 its reverse (120002002112), we get a palindrome (331202202133).

The spelling of 211200200021 in words is "two hundred eleven billion, two hundred million, two hundred thousand, twenty-one".