202110221221 has 4 divisors (see below), whose sum is σ = 202266775744. Its totient is φ = 201953666700.

The previous prime is 202110221189. The next prime is 202110221263. The reversal of 202110221221 is 122122011202.

It is a happy number.

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 202110221221 - 2⁵ = 202110221189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202110221195 and 202110221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202110221821) 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, 78275325 + ... + 78277906.

It is an arithmetic number, because the mean of its divisors is an integer number (50566693936).

Almost surely, 2^202110221221 is an apocalyptic number.

It is an amenable number.

202110221221 is a deficient number, since it is larger than the sum of its proper divisors (156554523).

202110221221 is a wasteful number, since it uses less digits than its factorization.

202110221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156554522.

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

Adding to 202110221221 its reverse (122122011202), we get a palindrome (324232232423).

The spelling of 202110221221 in words is "two hundred two billion, one hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".