202221201122221 has 4 divisors (see below), whose sum is σ = 204223391232444. Its totient is φ = 200219011012000.

The previous prime is 202221201122119. The next prime is 202221201122231. The reversal of 202221201122221 is 122221102122202.

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 182370709980900 + 19850491141321 = 13504470^2 + 4455389^2 .

It is a cyclic number.

It is not a de Polignac number, because 202221201122221 - 2⁷ = 202221201122093 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202221201122192 and 202221201122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202221201122231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001095054960 + ... + 1001095055161.

It is an arithmetic number, because the mean of its divisors is an integer number (51055847808111).

Almost surely, 2^{202221201122221} is an apocalyptic number.

It is an amenable number.

202221201122221 is a deficient number, since it is larger than the sum of its proper divisors (2002190110223).

202221201122221 is a wasteful number, since it uses less digits than its factorization.

202221201122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2002190110222.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 202221201122221 its reverse (122221102122202), we get a palindrome (324442303244423).

The spelling of 202221201122221 in words is "two hundred two trillion, two hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".