202122202221 has 12 divisors (see below), whose sum is σ = 297462864348. Its totient is φ = 132205716864.

The previous prime is 202122202213. The next prime is 202122202237. The reversal of 202122202221 is 122202221202.

It can be written as a sum of positive squares in 2 ways, for example, as 175237680996 + 26884521225 = 418614^2 + 163965^2 .

It is not a de Polignac number, because 202122202221 - 2³ = 202122202213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202122202194 and 202122202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202122202201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 211867660 + ... + 211868613.

It is an arithmetic number, because the mean of its divisors is an integer number (24788572029).

Almost surely, 2^202122202221 is an apocalyptic number.

It is an amenable number.

202122202221 is a deficient number, since it is larger than the sum of its proper divisors (95340662127).

202122202221 is a wasteful number, since it uses less digits than its factorization.

202122202221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423736332 (or 423736329 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 202122202221 its reverse (122202221202), we get a palindrome (324324423423).

It can be divided in two parts, 202 and 122202221, that multiplied together give a palindrome (24684848642).

The spelling of 202122202221 in words is "two hundred two billion, one hundred twenty-two million, two hundred two thousand, two hundred twenty-one".