210221201 has 6 divisors (see below), whose sum is σ = 223314870. Its totient is φ = 197854976.

The previous prime is 210221191. The next prime is 210221233. The reversal of 210221201 is 102122012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 141729025 + 68492176 = 11905^2 + 8276^2 .

It is a de Polignac number, because none of the positive numbers 2^k-210221201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (210221251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 363416 + ... + 363993.

It is an arithmetic number, because the mean of its divisors is an integer number (37219145).

Almost surely, 2^210221201 is an apocalyptic number.

It is an amenable number.

210221201 is a deficient number, since it is larger than the sum of its proper divisors (13093669).

210221201 is an equidigital number, since it uses as much as digits as its factorization.

210221201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 727443 (or 727426 counting only the distinct ones).

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

The square root of 210221201 is about 14499.0068970257. The cubic root of 210221201 is about 594.6008206900.

Adding to 210221201 its reverse (102122012), we get a palindrome (312343213).

The spelling of 210221201 in words is "two hundred ten million, two hundred twenty-one thousand, two hundred one".