20020121057 has 2 divisors, whose sum is σ = 20020121058. Its totient is φ = 20020121056.

The previous prime is 20020120997. The next prime is 20020121071. The reversal of 20020121057 is 75012102002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16410634816 + 3609486241 = 128104^2 + 60079^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020121057 - 2⁶ = 20020120993 is a prime.

It is not a weakly prime, because it can be changed into another prime (20020121657) 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, 10010060528 + 10010060529.

It is an arithmetic number, because the mean of its divisors is an integer number (10010060529).

Almost surely, 2^20020121057 is an apocalyptic number.

It is an amenable number.

20020121057 is a deficient number, since it is larger than the sum of its proper divisors (1).

20020121057 is an equidigital number, since it uses as much as digits as its factorization.

20020121057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 280, while the sum is 20.

Adding to 20020121057 its reverse (75012102002), we get a palindrome (95032223059).

The spelling of 20020121057 in words is "twenty billion, twenty million, one hundred twenty-one thousand, fifty-seven".