20021021222011 has 2 divisors, whose sum is σ = 20021021222012. Its totient is φ = 20021021222010.

The previous prime is 20021021222003. The next prime is 20021021222051. The reversal of 20021021222011 is 11022212012002.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20021021222011 - 2³ = 20021021222003 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021021222051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010510611005 + 10010510611006.

It is an arithmetic number, because the mean of its divisors is an integer number (10010510611006).

Almost surely, 2^{20021021222011} is an apocalyptic number.

20021021222011 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021021222011 is an equidigital number, since it uses as much as digits as its factorization.

20021021222011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20021021222011 its reverse (11022212012002), we get a palindrome (31043233234013).

The spelling of 20021021222011 in words is "twenty trillion, twenty-one billion, twenty-one million, two hundred twenty-two thousand, eleven".