202002221 has 4 divisors (see below), whose sum is σ = 202044444. Its totient is φ = 201960000.

The previous prime is 202002191. The next prime is 202002223. The reversal of 202002221 is 122200202.

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 88153321 + 113848900 = 9389^2 + 10670^2 .

It is a cyclic number.

It is not a de Polignac number, because 202002221 - 2¹⁰ = 202001197 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 (202002223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12860 + ... + 23861.

It is an arithmetic number, because the mean of its divisors is an integer number (50511111).

Almost surely, 2^202002221 is an apocalyptic number.

It is an amenable number.

202002221 is a deficient number, since it is larger than the sum of its proper divisors (42223).

202002221 is an equidigital number, since it uses as much as digits as its factorization.

202002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42222.

The product of its (nonzero) digits is 32, while the sum is 11.

The square root of 202002221 is about 14212.7485378445. The cubic root of 202002221 is about 586.7485812717.

Adding to 202002221 its reverse (122200202), we get a palindrome (324202423).

The spelling of 202002221 in words is "two hundred two million, two thousand, two hundred twenty-one".