202110211221 has 8 divisors (see below), whose sum is σ = 269484142944. Its totient is φ = 134738210160.

The previous prime is 202110211213. The next prime is 202110211243. The reversal of 202110211221 is 122112011202.

202110211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 202110211221 - 2³ = 202110211213 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 202110211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202110211421) 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 7 ways as a sum of consecutive naturals, for example, 217606 + ... + 671991.

It is an arithmetic number, because the mean of its divisors is an integer number (33685517868).

Almost surely, 2^202110211221 is an apocalyptic number.

It is an amenable number.

202110211221 is a deficient number, since it is larger than the sum of its proper divisors (67373931723).

202110211221 is an equidigital number, since it uses as much as digits as its factorization.

202110211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 965331.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 202110211221 its reverse (122112011202), we get a palindrome (324222222423).

The spelling of 202110211221 in words is "two hundred two billion, one hundred ten million, two hundred eleven thousand, two hundred twenty-one".