20201020122221 has 2 divisors, whose sum is σ = 20201020122222. Its totient is φ = 20201020122220.

The previous prime is 20201020122203. The next prime is 20201020122223. The reversal of 20201020122221 is 12222102010202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20185799965321 + 15220156900 = 4492861^2 + 123370^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201020122221 - 2²⁶ = 20200953013357 is a prime.

It is a Sophie Germain prime.

Together with 20201020122223, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 20201020122221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201020122223) 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, 10100510061110 + 10100510061111.

It is an arithmetic number, because the mean of its divisors is an integer number (10100510061111).

Almost surely, 2^{20201020122221} is an apocalyptic number.

It is an amenable number.

20201020122221 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201020122221 is an equidigital number, since it uses as much as digits as its factorization.

20201020122221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20201020122221 its reverse (12222102010202), we get a palindrome (32423122132423).

The spelling of 20201020122221 in words is "twenty trillion, two hundred one billion, twenty million, one hundred twenty-two thousand, two hundred twenty-one".