210212102221 has 12 divisors (see below), whose sum is σ = 234508242976. Its totient is φ = 188249636520.

The previous prime is 210212102203. The next prime is 210212102231. The reversal of 210212102221 is 122201212012.

It is a happy number.

It is not a de Polignac number, because 210212102221 - 2¹⁷ = 210211971149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210212102195 and 210212102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210212102231) 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 11 ways as a sum of consecutive naturals, for example, 12956745 + ... + 12972958.

Almost surely, 2^210212102221 is an apocalyptic number.

It is an amenable number.

210212102221 is a deficient number, since it is larger than the sum of its proper divisors (24296140755).

210212102221 is a wasteful number, since it uses less digits than its factorization.

210212102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25929792 (or 25929781 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210212102221 its reverse (122201212012), we get a palindrome (332413314233).

The spelling of 210212102221 in words is "two hundred ten billion, two hundred twelve million, one hundred two thousand, two hundred twenty-one".