20002021122121 has 2 divisors, whose sum is σ = 20002021122122. Its totient is φ = 20002021122120.

The previous prime is 20002021122103. The next prime is 20002021122157. The reversal of 20002021122121 is 12122112020002.

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., 19999329587721 + 2691534400 = 4472061^2 + 51880^2 .

It is a cyclic number.

It is not a de Polignac number, because 20002021122121 - 2¹¹ = 20002021120073 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20002021122095 and 20002021122104.

It is not a weakly prime, because it can be changed into another prime (20002021122101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001010561060 + 10001010561061.

It is an arithmetic number, because the mean of its divisors is an integer number (10001010561061).

Almost surely, 2^{20002021122121} is an apocalyptic number.

It is an amenable number.

20002021122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002021122121 is an equidigital number, since it uses as much as digits as its factorization.

20002021122121 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 20002021122121 its reverse (12122112020002), we get a palindrome (32124133142123).

The spelling of 20002021122121 in words is "twenty trillion, two billion, twenty-one million, one hundred twenty-two thousand, one hundred twenty-one".