It's about 55 times the number of Submarines in the US Navy.
It's about 45 times the number of Keys on a Piano.
It's about forty times the number of Wolves in Yellowstone National Park.
In other words, 4,100 is 39.40 times the count of Wolves in Yellowstone National Park, and the count of Wolves in Yellowstone National Park is 0.0254 times that amount.(a.k.a. Henihco'oo; a.k.a. Héetíhco'oo) (December 2014 figures; Wyoming Park area)
As of the 2014 population count, there were 104 wolves living in Yellowstone National Park, in twelve packs. All of the wolves now living in the Park are thought to have descended from the 66 wolves (re)introduced into the Park in 1995-96.
It's about thirty times the number of Elements on the Periodic Table.
In other words, 4,100 is 34.70 times the count of Elements on the Periodic Table, and the count of Elements on the Periodic Table is 0.0288 times that amount.(a.k.a. Periodic Table of the Elements, a.k.a chemical elements) (confirmed elements as of 2016)
From element number one, hydrogen, to element one-hundred eighteen, ununoctium, there are 118 confirmed elements on the Periodic Table. Ninety-four of the elements exist in nature, and the remaining twenty-four have only been synthesized in labs (not having occurred naturally in the time since scientists have begun researching them)
It's about thirty times the number of Union Stations in the United States.
In other words, 4,100 is 30.40 times the count of Union Stations in the United States, and the count of Union Stations in the United States is 0.0329 times that amount.(a.k.a. Union Terminal; a.k.a. Joint Station; a.k.a. Union Depot) (2016 figures)
It's about thirty times the number of Moons in our Solar System.
In other words, 4,100 is 28.10 times the count of Moons in our Solar System, and the count of Moons in our Solar System is 0.0356 times that amount.(2015 figures) (confirmed moons only; dwarf planet satellites not included)
Astronomers and other scientists have confirmed the presence of 146 moons orbiting the major planets of our Solar System. About one third of those moons — 53 — are in orbit around the planet Saturn
It's about twenty times the number of John Wayne films.
In other words, the count of John Wayne films is 0.0435 times 4,100.(a.k.a. "Duke", a.k.a. JW, a.k.a. Marion Mitchell Morrison, a.k.a. Marion Robert Morrison, a.k.a. Duke Morrison) (films starring the actor in any size role)