20021100011173 has 2 divisors, whose sum is σ = 20021100011174. Its totient is φ = 20021100011172.

The previous prime is 20021100011089. The next prime is 20021100011183. The reversal of 20021100011173 is 37111000112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14645370263329 + 5375729747844 = 3826927^2 + 2318562^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021100011173 - 2²⁹ = 20020563140261 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021100011173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021100011183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550005586 + 10010550005587.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550005587).

Almost surely, 2^{20021100011173} is an apocalyptic number.

It is an amenable number.

20021100011173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021100011173 is an equidigital number, since it uses as much as digits as its factorization.

20021100011173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 19.

Adding to 20021100011173 its reverse (37111000112002), we get a palindrome (57132100123175).

The spelling of 20021100011173 in words is "twenty trillion, twenty-one billion, one hundred million, eleven thousand, one hundred seventy-three".