202221323021 has 4 divisors (see below), whose sum is σ = 202222946172. Its totient is φ = 202219699872.

The previous prime is 202221322993. The next prime is 202221323041. The reversal of 202221323021 is 120323122202.

It is a happy number.

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 192182284996 + 10039038025 = 438386^2 + 100195^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221323021 - 2¹⁰ = 202221321997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221322984 and 202221323002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221323041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 607610 + ... + 879563.

It is an arithmetic number, because the mean of its divisors is an integer number (50555736543).

Almost surely, 2^202221323021 is an apocalyptic number.

It is an amenable number.

202221323021 is a deficient number, since it is larger than the sum of its proper divisors (1623151).

202221323021 is a wasteful number, since it uses less digits than its factorization.

202221323021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1623150.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 202221323021 its reverse (120323122202), we get a palindrome (322544445223).

The spelling of 202221323021 in words is "two hundred two billion, two hundred twenty-one million, three hundred twenty-three thousand, twenty-one".