It's about 2,000 times as heavy as a Human Brain
In other words, 42,000,000 grains is 2,020 times the weight of a Human Brain, and the weight of a Human Brain is 0.000495 times that amount.(adult)
The average weight of an adult human brain is between 20,800 grains. 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 2,500 times as heavy as a liter of Water
In other words, 42,000,000 grains is 2,721.4780 times the weight of a liter of Water, and the weight of a liter of Water is 0.0003674474 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 15,432.790 grains 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 one-three-thousand-five-hundredth as heavy as The Eiffel Tower
In other words, 42,000,000 grains is 0.000269 times the weight of The Eiffel Tower, and the weight of The Eiffel Tower is 3,720 times that amount.(a.k.a. La Tour Eiffel) (Paris, France) (total weight)
The Eiffel Tower weighs approximately 156,000,000,000 grains. Architected to be quickly assembled, the Tower contains only 930 cu. meters of solid material.
It's about 4,500 times as heavy as a Basketball
In other words, 42,000,000 grains is 4,363.63636360 times the weight of a Basketball, and the weight of a Basketball is 0.00022916666667 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 9,625 grains. These balls have 4,118 pebbles each with a diameter of 2.5 mm
It's about one-five-thousandth as heavy as The Brooklyn Bridge
In other words, 42,000,000 grains is 0.0002043 times the weight of The Brooklyn Bridge, and the weight of The Brooklyn Bridge is 4,895 times that amount.(a.k.a. New York and Brooklyn Bridge) (Manhattan and Brooklyn, New York City, New York) (total weight)
The total weight of the Brooklyn Bridge is approximately 205,600,000,000 grains. In a promotional event to prove the bridge's stability shortly after it opened, entertainer P. T. Barnum led a parade of 21 elephants across it in May of 1884.
It's about 6,500 times as heavy as a Football (Soccer)
In other words, the weight of a Football (Soccer) is 0.00016 times 42,000,000 grains.(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 6,300 grains and 6,900 grains. 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 6,500 times as heavy as a Football (American)
In other words, 42,000,000 grains is 6,620.6896551720 times the weight of a Football (American), and the weight of a Football (American) is 0.0001510416666667 times that amount.(a.k.a. "pigskin") (NFL standard)
Per National Football League official rules, an American football must weigh between 6,125 grains and 6,562.50 grains. Because of NFL regulations, ceremonial considerations, and backup requirements, each NFL Superbowl requires the manufacture of 144 balls exclusively for the event.