210221211 has 4 divisors (see below), whose sum is σ = 280294952. Its totient is φ = 140147472.

The previous prime is 210221191. The next prime is 210221233. The reversal of 210221211 is 112122012.

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

It is not a de Polignac number, because 210221211 - 2¹⁵ = 210188443 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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35036866 + ... + 35036871.

It is an arithmetic number, because the mean of its divisors is an integer number (70073738).

Almost surely, 2^210221211 is an apocalyptic number.

210221211 is a deficient number, since it is larger than the sum of its proper divisors (70073741).

210221211 is an equidigital number, since it uses as much as digits as its factorization.

210221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70073740.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 210221211 is about 14499.0072418769. The cubic root of 210221211 is about 594.6008301182.

Adding to 210221211 its reverse (112122012), we get a palindrome (322343223).

The spelling of 210221211 in words is "two hundred ten million, two hundred twenty-one thousand, two hundred eleven".