202220020021 has 2 divisors, whose sum is σ = 202220020022. Its totient is φ = 202220020020.

The previous prime is 202220019997. The next prime is 202220020027. The reversal of 202220020021 is 120020022202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197967154225 + 4252865796 = 444935^2 + 65214^2 .

It is a cyclic number.

It is not a de Polignac number, because 202220020021 - 2¹⁹ = 202219495733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202220019983 and 202220020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202220020027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101110010010 + 101110010011.

It is an arithmetic number, because the mean of its divisors is an integer number (101110010011).

Almost surely, 2^202220020021 is an apocalyptic number.

It is an amenable number.

202220020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

202220020021 is an equidigital number, since it uses as much as digits as its factorization.

202220020021 is an evil number, because the sum of its binary digits is even.

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

Adding to 202220020021 its reverse (120020022202), we get a palindrome (322240042223).

The spelling of 202220020021 in words is "two hundred two billion, two hundred twenty million, twenty thousand, twenty-one".