20021100110173 has 2 divisors, whose sum is σ = 20021100110174. Its totient is φ = 20021100110172.

The previous prime is 20021100110161. The next prime is 20021100110227. The reversal of 20021100110173 is 37101100112002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14599108690884 + 5421991419289 = 3820878^2 + 2328517^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20021100110173 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20021100110173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20021100119173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010550055086 + 10010550055087.

It is an arithmetic number, because the mean of its divisors is an integer number (10010550055087).

Almost surely, 2^{20021100110173} is an apocalyptic number.

It is an amenable number.

20021100110173 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021100110173 is an equidigital number, since it uses as much as digits as its factorization.

20021100110173 is an evil number, because the sum of its binary digits is even.

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

Adding to 20021100110173 its reverse (37101100112002), we get a palindrome (57122200222175).

The spelling of 20021100110173 in words is "twenty trillion, twenty-one billion, one hundred million, one hundred ten thousand, one hundred seventy-three".