202101221 has 4 divisors (see below), whose sum is σ = 230972832. Its totient is φ = 173229612.

The previous prime is 202101217. The next prime is 202101223. The reversal of 202101221 is 122101202.

It is a happy number.

202101221 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 202101221 - 2² = 202101217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202101223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14435795 + ... + 14435808.

It is an arithmetic number, because the mean of its divisors is an integer number (57743208).

Almost surely, 2^202101221 is an apocalyptic number.

It is an amenable number.

202101221 is a deficient number, since it is larger than the sum of its proper divisors (28871611).

202101221 is an equidigital number, since it uses as much as digits as its factorization.

202101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28871610.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 202101221 is about 14216.2308999256. The cubic root of 202101221 is about 586.8444195292.

Adding to 202101221 its reverse (122101202), we get a palindrome (324202423).

The spelling of 202101221 in words is "two hundred two million, one hundred one thousand, two hundred twenty-one".