202110221 has 2 divisors, whose sum is σ = 202110222. Its totient is φ = 202110220.

The previous prime is 202110187. The next prime is 202110281. The reversal of 202110221 is 122011202.

It is a happy number.

202110221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143664196 + 58446025 = 11986^2 + 7645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202110221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202110281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101055110 + 101055111.

It is an arithmetic number, because the mean of its divisors is an integer number (101055111).

Almost surely, 2^202110221 is an apocalyptic number.

It is an amenable number.

202110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202110221 is an equidigital number, since it uses as much as digits as its factorization.

202110221 is an evil number, because the sum of its binary digits is even.

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

The square root of 202110221 is about 14216.5474359987. The cubic root of 202110221 is about 586.8531305460.

Adding to 202110221 its reverse (122011202), we get a palindrome (324121423).

The spelling of 202110221 in words is "two hundred two million, one hundred ten thousand, two hundred twenty-one".