20022200021 has 2 divisors, whose sum is σ = 20022200022. Its totient is φ = 20022200020.

The previous prime is 20022199997. The next prime is 20022200059. The reversal of 20022200021 is 12000222002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15070263121 + 4951936900 = 122761^2 + 70370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20022200021 - 2¹⁴ = 20022183637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20022199975 and 20022200011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20022200221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10011100010 + 10011100011.

It is an arithmetic number, because the mean of its divisors is an integer number (10011100011).

Almost surely, 2^20022200021 is an apocalyptic number.

It is an amenable number.

20022200021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20022200021 is an equidigital number, since it uses as much as digits as its factorization.

20022200021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 11.

Adding to 20022200021 its reverse (12000222002), we get a palindrome (32022422023).

The spelling of 20022200021 in words is "twenty billion, twenty-two million, two hundred thousand, twenty-one".