It's about 1,500 times as heavy as a Human Brain
In other words, 2,100 kilograms is 1,560 times the weight of a Human Brain, and the weight of a Human Brain is 0.000641 times that amount.(adult)
The average weight of an adult human brain is between 1.350 kilograms. In humans and primates, sight and vision utilize about 30 different parts of the brain which together account for about half of the brain's size.
It's about 2,000 times as heavy as a liter of Water
In other words, 2,100 kilograms is 2,099.9410 times the weight of a liter of Water, and the weight of a liter of Water is 0.0004762039 times that amount.(fresh; 4° C / 39.2° F; maximum density)
Contrary to popular belief, 1 liter (0.0.264172052358148 gal) of water at 4° C / 39.2° F (its point of maximum density) weighs 1.000028 kg rather than 1 kg exactly. The total volume of water on the planet Earth is about 13,590,000,000,000,000,000 (13.59 quntillion) L (3,590,000,000,000,000,000 gallons).
It's about 3,500 times as heavy as a Basketball
In other words, 2,100 kilograms is 3,367.0600043 times the weight of a Basketball, and the weight of a Basketball is 0.00029699500416 times that amount.(NBA official ball standards, Size 7)
A regulation NBA basketball, manufactured by Spalding, is known as a Size 7 ball and weighs 0.623689508750 kilograms. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about one-five-thousandth as heavy as The Eiffel Tower
In other words, 2,100 kilograms is 0.000208 times the weight of The Eiffel Tower, and the weight of The Eiffel Tower is 4,810 times that amount.(a.k.a. La Tour Eiffel) (Paris, France) (total weight)
The Eiffel Tower weighs approximately 10,100,000 kilograms. Architected to be quickly assembled, the Tower contains only 930 cu. meters of solid material.
It's about 5,000 times as heavy as a Football (Soccer)
In other words, the weight of a Football (Soccer) is 0.0002 times 2,100 kilograms.(a.k.a. Soccer, a.k.a. Association Football) (FIFA Law 2 specification)
According to FIFA's Law of the Game number 2, a football must weigh between 0.410 kilograms and 0.450 kilograms. An artifact on display at the Smith Art Gallery in Museum in Stirling, Scotland is said to be the world's oldest football and is about one-third to one-half the size of a modern football.
It's about 5,000 times as heavy as a Football (American)
In other words, 2,100 kilograms is 5,108.6427651120 times the weight of a Football (American), and the weight of a Football (American) is 0.0001957467072917 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 0.396893323750 kilograms and 0.4252428468750 kilograms. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.
It's about 6,000 times as heavy as a Can of Soup
In other words, the weight of a Can of Soup is 0.00017 times 2,100 kilograms.(for Campbell''s Condensed Tomato Soup, 317.9 ml)
A can of Campbell''s Tomato Soup weighs 0.350 kilograms. Cans have been used to store soup and other foods since their invention in 1913, but a dedicated can opener was not developed until cans began to use thinner materials — prior to that time, cans were usually opened using various blunt instruments and tools.