20001343122121 has 2 divisors, whose sum is σ = 20001343122122. Its totient is φ = 20001343122120.

The previous prime is 20001343122097. The next prime is 20001343122169. The reversal of 20001343122121 is 12122134310002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19197200494521 + 804142627600 = 4381461^2 + 896740^2 .

It is a cyclic number.

It is not a de Polignac number, because 20001343122121 - 2¹⁵ = 20001343089353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20001343122092 and 20001343122101.

It is not a weakly prime, because it can be changed into another prime (20001343129121) 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, 10000671561060 + 10000671561061.

It is an arithmetic number, because the mean of its divisors is an integer number (10000671561061).

Almost surely, 2^{20001343122121} is an apocalyptic number.

It is an amenable number.

20001343122121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001343122121 is an equidigital number, since it uses as much as digits as its factorization.

20001343122121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 20001343122121 its reverse (12122134310002), we get a palindrome (32123477432123).

The spelling of 20001343122121 in words is "twenty trillion, one billion, three hundred forty-three million, one hundred twenty-two thousand, one hundred twenty-one".