20202121117 has 2 divisors, whose sum is σ = 20202121118. Its totient is φ = 20202121116.

The previous prime is 20202121099. The next prime is 20202121123. The reversal of 20202121117 is 71112120202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17910201241 + 2291919876 = 133829^2 + 47874^2 .

It is a cyclic number.

It is not a de Polignac number, because 20202121117 - 2²⁷ = 20067903389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20202121094 and 20202121103.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20202121157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10101060558 + 10101060559.

It is an arithmetic number, because the mean of its divisors is an integer number (10101060559).

Almost surely, 2^20202121117 is an apocalyptic number.

It is an amenable number.

20202121117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20202121117 is an equidigital number, since it uses as much as digits as its factorization.

20202121117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 20202121117 its reverse (71112120202), we get a palindrome (91314241319).

The spelling of 20202121117 in words is "twenty billion, two hundred two million, one hundred twenty-one thousand, one hundred seventeen".