210221212221 has 16 divisors (see below), whose sum is σ = 311451918720. Its totient is φ = 140141586240.

The previous prime is 210221212219. The next prime is 210221212291. The reversal of 210221212221 is 122212122012.

It is a happy number.

210221212221 is a `hidden beast` number, since 2 + 10 + 221 + 212 + 221 = 666.

It is not a de Polignac number, because 210221212221 - 2¹ = 210221212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210221212194 and 210221212203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221212291) 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 15 ways as a sum of consecutive naturals, for example, 547056 + ... + 848358.

It is an arithmetic number, because the mean of its divisors is an integer number (19465744920).

Almost surely, 2^210221212221 is an apocalyptic number.

It is an amenable number.

210221212221 is a deficient number, since it is larger than the sum of its proper divisors (101230706499).

210221212221 is a wasteful number, since it uses less digits than its factorization.

210221212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327153 (or 327147 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 210221212221 its reverse (122212122012), we get a palindrome (332433334233).

The spelling of 210221212221 in words is "two hundred ten billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-one".