20021002117 has 2 divisors, whose sum is σ = 20021002118. Its totient is φ = 20021002116.

The previous prime is 20021002091. The next prime is 20021002159. The reversal of 20021002117 is 71120012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19959755841 + 61246276 = 141279^2 + 7826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021002117 - 2⁷ = 20021001989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021002117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021002517) 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, 10010501058 + 10010501059.

It is an arithmetic number, because the mean of its divisors is an integer number (10010501059).

Almost surely, 2^20021002117 is an apocalyptic number.

It is an amenable number.

20021002117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021002117 is an equidigital number, since it uses as much as digits as its factorization.

20021002117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 16.

Adding to 20021002117 its reverse (71120012002), we get a palindrome (91141014119).

The spelling of 20021002117 in words is "twenty billion, twenty-one million, two thousand, one hundred seventeen".