210221212211 has 12 divisors (see below), whose sum is σ = 214964007048. Its totient is φ = 205571421792.

The previous prime is 210221212207. The next prime is 210221212219. The reversal of 210221212211 is 112212122012.

It is not a de Polignac number, because 210221212211 - 2² = 210221212207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 210221212211.

It is not an unprimeable number, because it can be changed into a prime (210221212219) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444080 + ... + 785906.

It is an arithmetic number, because the mean of its divisors is an integer number (17913667254).

Almost surely, 2^210221212211 is an apocalyptic number.

210221212211 is a deficient number, since it is larger than the sum of its proper divisors (4742794837).

210221212211 is an equidigital number, since it uses as much as digits as its factorization.

210221212211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342098 (or 342031 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210221212211 its reverse (112212122012), we get a palindrome (322433334223).

The spelling of 210221212211 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, two hundred eleven".