202021022221 has 2 divisors, whose sum is σ = 202021022222. Its totient is φ = 202021022220.

The previous prime is 202021022213. The next prime is 202021022227. The reversal of 202021022221 is 122220120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 196435104100 + 5585918121 = 443210^2 + 74739^2 .

It is a cyclic number.

It is not a de Polignac number, because 202021022221 - 2³ = 202021022213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202021022195 and 202021022204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202021022227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101010511110 + 101010511111.

It is an arithmetic number, because the mean of its divisors is an integer number (101010511111).

Almost surely, 2^202021022221 is an apocalyptic number.

It is an amenable number.

202021022221 is a deficient number, since it is larger than the sum of its proper divisors (1).

202021022221 is an equidigital number, since it uses as much as digits as its factorization.

202021022221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 202021022221 its reverse (122220120202), we get a palindrome (324241142423).

The spelling of 202021022221 in words is "two hundred two billion, twenty-one million, twenty-two thousand, two hundred twenty-one".