20021020022021 has 2 divisors, whose sum is σ = 20021020022022. Its totient is φ = 20021020022020.

The previous prime is 20021020021999. The next prime is 20021020022041. The reversal of 20021020022021 is 12022002012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13203150700996 + 6817869321025 = 3633614^2 + 2611105^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021020022021 - 2¹⁰ = 20021020020997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20021020021987 and 20021020022005.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021020022041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510011010 + 10010510011011.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510011011).

Almost surely, 2^{20021020022021} is an apocalyptic number.

It is an amenable number.

20021020022021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021020022021 is an equidigital number, since it uses as much as digits as its factorization.

20021020022021 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 14.

Adding to 20021020022021 its reverse (12022002012002), we get a palindrome (32043022034023).

The spelling of 20021020022021 in words is "twenty trillion, twenty-one billion, twenty million, twenty-two thousand, twenty-one".