20000020020121 has 2 divisors, whose sum is σ = 20000020020122. Its totient is φ = 20000020020120.

The previous prime is 20000020020119. The next prime is 20000020020137. The reversal of 20000020020121 is 12102002000002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11417674790025 + 8582345230096 = 3379005^2 + 2929564^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000020020121 - 2¹ = 20000020020119 is a prime.

Together with 20000020020119, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 20000020020098 and 20000020020107.

It is not a weakly prime, because it can be changed into another prime (20000020026121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10000010010060 + 10000010010061.

It is an arithmetic number, because the mean of its divisors is an integer number (10000010010061).

Almost surely, 2^{20000020020121} is an apocalyptic number.

It is an amenable number.

20000020020121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20000020020121 is an equidigital number, since it uses as much as digits as its factorization.

20000020020121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000020020121 its reverse (12102002000002), we get a palindrome (32102022020123).

The spelling of 20000020020121 in words is "twenty trillion, twenty million, twenty thousand, one hundred twenty-one".