20001020122201 has 2 divisors, whose sum is σ = 20001020122202. Its totient is φ = 20001020122200.

The previous prime is 20001020122183. The next prime is 20001020122277. The reversal of 20001020122201 is 10222102010002.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18445951265625 + 1555068856576 = 4294875^2 + 1247024^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001020122201 - 2¹⁵ = 20001020089433 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001020122901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000510061100 + 10000510061101.

It is an arithmetic number, because the mean of its divisors is an integer number (10000510061101).

Almost surely, 2^{20001020122201} is an apocalyptic number.

It is an amenable number.

20001020122201 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001020122201 is an equidigital number, since it uses as much as digits as its factorization.

20001020122201 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 13.

Adding to 20001020122201 its reverse (10222102010002), we get a palindrome (30223122132203).

The spelling of 20001020122201 in words is "twenty trillion, one billion, twenty million, one hundred twenty-two thousand, two hundred one".