20220020021 has 2 divisors, whose sum is σ = 20220020022. Its totient is φ = 20220020020.

The previous prime is 20220020011. The next prime is 20220020033. The reversal of 20220020021 is 12002002202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19795083025 + 424936996 = 140695^2 + 20614^2 .

It is a cyclic number.

It is not a de Polignac number, because 20220020021 - 2¹⁴ = 20220003637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20220019984 and 20220020011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20220020011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10110010010 + 10110010011.

It is an arithmetic number, because the mean of its divisors is an integer number (10110010011).

Almost surely, 2^20220020021 is an apocalyptic number.

It is an amenable number.

20220020021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20220020021 is an equidigital number, since it uses as much as digits as its factorization.

20220020021 is an evil number, because the sum of its binary digits is even.

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

Adding to 20220020021 its reverse (12002002202), we get a palindrome (32222022223).

The spelling of 20220020021 in words is "twenty billion, two hundred twenty million, twenty thousand, twenty-one".