It's about as heavy as a Rhinoceros.
(for Black rhinoceros, Diceros bicornis) (Adult, male)
An adult black rhinoceros weighs between 2,100,000 grams. Rhinoceros are extremely aggressive — nearly one of every two males will die as a result of fighting with other rhinoceros.
It's about four-fifths as heavy as a Giraffe.
In other words, 2,100,000 grams is 0.840 times the weight of a Giraffe, and the weight of a Giraffe is 1.20 times that amount.(Giraffa camelopardalis reticulata) (adult, male)
An adult, male giraffe weighs an average of 2,500,000 grams. Reaching 5.5 m (18 ft) in height by adulthood, giraffe calves can grow as much as 3 cm (1 in) per day.
It's about one-and-one-fourth times as heavy as a Car.
In other words, 2,100,000 grams is 1.2710 times the weight of a Car, and the weight of a Car is 0.78680 times that amount.(for 2009 Ford Taurus; automatic transmission; curb weight)
A 2009 Ford Taurus weighs 1,652,000 grams. The first mass-produced car, the Curved Dash Oldsmobile — introduced in 1901 — weighed just 386,000 grams.
It's about four-fifths as heavy as The Tongue of a Blue Whale.
In other words, 2,100,000 grams is 0.780 times the weight of The Tongue of a Blue Whale, and the weight of The Tongue of a Blue Whale is 1.30 times that amount.(Balaenoptera musculus) (adult)
The tongue of a Blue Whale can weigh up to 2,700,000 grams. Despite their tremendous size, blue whales feed almost exclusively on tiny crustaceans called krill and cannot swallow anything much larger than a beach ball.
It's about three-fifths as heavy as a Hippopotamus.
In other words, 2,100,000 grams is 0.560 times the weight of a Hippopotamus, and the weight of a Hippopotamus is 1.790 times that amount.(Hippopotamus amphibius) (adult, male)
The average weight of an adult male hippopotamus ranges from 3,750,000 grams. Appearances to the contrary, adult hippos cannot swim or float in water; they actually move by leaping and walking across lake bottoms at about 8 kph (5 mph).
It's about one-third as heavy as an Elephant.
In other words, the weight of an Elephant is 2.90 times 2,100,000 grams.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100,000 grams. Among African elephants, both males and females have tusks (whereas female Asian elephants, Elephas maximus, do not have tusks) which can grow to 3 m (10 ft) and typically weigh about 4,000,000 grams
It's about one-third as heavy as a Tyrannosaurus rex.
In other words, the weight of a Tyrannosaurus rex is 3 times 2,100,000 grams.(for FMNH PR2081, a.k.a. "Sue") (a.k.a. Tyrannosaurus, a.k.a. T-Rex) (estimated live weight)
The notable Tyrannosaurus specimen housed at the Field Museum of Natural History in Chicago, Illinois, "Sue," is estimated to have weighed about 6,400,000 grams while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.