It's about 350,000 times as heavy as a Quarter
In other words, 2,100 kilograms is 370,400 times the weight of a Quarter, and the weight of a Quarter is 0.00000270 times that amount.(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. America the Beautiful quarter, a.k.a. two bits)
The America the Beautiful series quarters, which began to enter circulation in 2017, weigh 0.00567 kilograms each. In answer to the common riddle, there are 119 ridges around the edge of the coin in its current design.
It's about 300,000 times as heavy as an Eye (Human)
In other words, the weight of an Eye (Human) is 0.00000330 times 2,100 kilograms.(adult)
A fully developed eye (in a person over the age of thirteen), weighs about 0.0071 kilograms. The pupil of the eye varies depending on the amount of light it is exposed to, but typically measures about 4 mm across.
It's about 200,000 times as heavy as a Battery (AAA)
In other words, 2,100 kilograms is 180,000 times the weight of a Battery (AAA), and the weight of a Battery (AAA) is 0.00000560 times that amount.(Alkaline)
An "AAA" size battery weighs 0.012 kilograms. Batteries are named by the American National Standards Institute (ANSI) Committee C18 and AAA batteries were given their name because they were smaller than the "AA" and "A" size batteries which were invented first.
It's about 150,000 times as heavy as a Compact disc
It's about 100,000 times as heavy as a Mouse
In other words, the weight of a Mouse is 0.00001000 times 2,100 kilograms.(a.k.a. "House mouse", Mus musculus) (adult)
The weight of a mouse is typically an average of 0.021 kilograms. While most mice typically live two to three years, the Methuselah Mouse Prize — an award administered by a non-profit organization which advances aging-related research — was once awarded to a team of scientists whose research resulted in a mouse living just under five years.
It's about 90,000 times as heavy as a Battery (AA)
In other words, 2,100 kilograms is 88,000 times the weight of a Battery (AA), and the weight of a Battery (AA) is 0.0000110 times that amount.(Alkaline)
An "AA" size battery weighs 0.024 kilograms. AA batteries came into common use during World War II and were given their name by the American National Standards Institute (ANSI) Committee C18 because they were smaller than the "A" size batteries which were invented first.
It's about 60,000 times as heavy as a Light Bulb
In other words, 2,100 kilograms is 62,000 times the weight of a Light Bulb, and the weight of a Light Bulb is 0.0000160 times that amount.(a.k.a. lamp) (for A19-size, 60w, incandescent bulb by Bulbrite; package weight)
A standard, sixty-watt light bulb weighs about 0.034 kilograms. The tightly-coiled filament inside a bulb of this size would measure about 579mm if uncoiled and stretched out.