22022020021 has 2 divisors, whose sum is σ = 22022020022. Its totient is φ = 22022020020.

The previous prime is 22022020001. The next prime is 22022020037. The reversal of 22022020021 is 12002022022.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11610062500 + 10411957521 = 107750^2 + 102039^2 .

It is a cyclic number.

It is not a de Polignac number, because 22022020021 - 2⁵ = 22022019989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22022019983 and 22022020010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22022020001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11011010010 + 11011010011.

It is an arithmetic number, because the mean of its divisors is an integer number (11011010011).

Almost surely, 2^22022020021 is an apocalyptic number.

It is an amenable number.

22022020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

22022020021 is an equidigital number, since it uses as much as digits as its factorization.

22022020021 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 22022020021 its reverse (12002022022), we get a palindrome (34024042043).

The spelling of 22022020021 in words is "twenty-two billion, twenty-two million, twenty thousand, twenty-one".