202202221 has 4 divisors (see below), whose sum is σ = 217756252. Its totient is φ = 186648192.

The previous prime is 202202171. The next prime is 202202279. The reversal of 202202221 is 122202202.

202202221 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 an emirpimes, since its reverse is a distinct semiprime: 122202202 = 2 ⋅61101101.

It can be written as a sum of positive squares in 2 ways, for example, as 119137225 + 83064996 = 10915^2 + 9114^2 .

It is a cyclic number.

It is not a de Polignac number, because 202202221 - 2¹⁹ = 201677933 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 15554017 = 202202221 / (2 + 0 + 2 + 2 + 0 + 2 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202202621) 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, 7776996 + ... + 7777021.

It is an arithmetic number, because the mean of its divisors is an integer number (54439063).

Almost surely, 2^202202221 is an apocalyptic number.

It is an amenable number.

202202221 is a deficient number, since it is larger than the sum of its proper divisors (15554031).

202202221 is a wasteful number, since it uses less digits than its factorization.

202202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15554030.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 202202221 is about 14219.7827339239. The cubic root of 202202221 is about 586.9421616659.

Adding to 202202221 its reverse (122202202), we get a palindrome (324404423).

The spelling of 202202221 in words is "two hundred two million, two hundred two thousand, two hundred twenty-one".