22020202021 has 4 divisors (see below), whose sum is σ = 22028077612. Its totient is φ = 22012326432.

The previous prime is 22020202013. The next prime is 22020202031. The reversal of 22020202021 is 12020202022.

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 10829524225 + 11190677796 = 104065^2 + 105786^2 .

It is a cyclic number.

It is not a de Polignac number, because 22020202021 - 2³ = 22020202013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22020201992 and 22020202010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22020202031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3933600 + ... + 3939193.

It is an arithmetic number, because the mean of its divisors is an integer number (5507019403).

Almost surely, 2^22020202021 is an apocalyptic number.

It is an amenable number.

22020202021 is a deficient number, since it is larger than the sum of its proper divisors (7875591).

22020202021 is an equidigital number, since it uses as much as digits as its factorization.

22020202021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7875590.

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

Adding to 22020202021 its reverse (12020202022), we get a palindrome (34040404043).

Subtracting from 22020202021 its reverse (12020202022), we obtain a palindrome (9999999999).

The spelling of 22020202021 in words is "twenty-two billion, twenty million, two hundred two thousand, twenty-one".