20200021117 has 2 divisors, whose sum is σ = 20200021118. Its totient is φ = 20200021116.

The previous prime is 20200021103. The next prime is 20200021123. The reversal of 20200021117 is 71112000202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11887322841 + 8312698276 = 109029^2 + 91174^2 .

It is a cyclic number.

It is not a de Polignac number, because 20200021117 - 2⁷ = 20200020989 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20200021117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20200021417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10100010558 + 10100010559.

It is an arithmetic number, because the mean of its divisors is an integer number (10100010559).

Almost surely, 2^20200021117 is an apocalyptic number.

It is an amenable number.

20200021117 is a deficient number, since it is larger than the sum of its proper divisors (1).

20200021117 is an equidigital number, since it uses as much as digits as its factorization.

20200021117 is an evil number, because the sum of its binary digits is even.

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

Adding to 20200021117 its reverse (71112000202), we get a palindrome (91312021319).

The spelling of 20200021117 in words is "twenty billion, two hundred million, twenty-one thousand, one hundred seventeen".