210221102221 has 4 divisors (see below), whose sum is σ = 226391956252. Its totient is φ = 194050248192.

The previous prime is 210221102209. The next prime is 210221102227. The reversal of 210221102221 is 122201122012.

It is a happy number.

210221102221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18211502500 + 192009599721 = 134950^2 + 438189^2 .

It is a cyclic number.

It is not a de Polignac number, because 210221102221 - 2¹⁵ = 210221069453 is a prime.

It is a super-2 number, since 2×210221102221² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210221102195 and 210221102204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221102227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8085426996 + ... + 8085427021.

It is an arithmetic number, because the mean of its divisors is an integer number (56597989063).

Almost surely, 2^210221102221 is an apocalyptic number.

It is an amenable number.

210221102221 is a deficient number, since it is larger than the sum of its proper divisors (16170854031).

210221102221 is a wasteful number, since it uses less digits than its factorization.

210221102221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16170854030.

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

Adding to 210221102221 its reverse (122201122012), we get a palindrome (332422224233).

The spelling of 210221102221 in words is "two hundred ten billion, two hundred twenty-one million, one hundred two thousand, two hundred twenty-one".