It's about three-fifths as heavy as a Hippopotamus
In other words, 2,100 kilograms 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 3,000 to 4,500 kg. 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 kilograms.(for African bush elephant, Loxodonta africana) (Adult, bull)
A bull African bush elephant weighs about 6,100 kg. 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 kg
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 kilograms.(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 kilograms while alive. A renowned predator in popular culture, the teeth of tyrannosaurus rex were up to 33.02 cm (13 in) long.
It's about one-fifth as heavy as an Anchor of a Cruise Ship
In other words, 2,100 kilograms is 0.1860 times the weight of an Anchor of a Cruise Ship, and the weight of an Anchor of a Cruise Ship is 5.380 times that amount.(for QE2 forward anchor, a.k.a. RMS Queen Elizabeth 2)
Each of the forward anchors of the RMS Queen Elizabeth 2 weighs 11,300 kg. The anchor of the QE2 now sits in front of the Holyrood Church in Southampton, England, United Kingdom, along a pedestrian tourist route known as "the QE2 mile."
It's about one-thirty-fifth as heavy as The Space Shuttle
In other words, the weight of The Space Shuttle is 33 times 2,100 kilograms.(for Endeavour, a.k.a. OV-105, a.k.a. Orbiter Vehicle-105) (empty weight, excluding main engines)
When empty, the space shuttle Endeavour weighs 71,000 kilograms. The shuttle's spacious cargo bay carried the Chandra X-ray Observatory into orbit in 1999 — a payload that weighed 19,737 kg.
It's about one-fiftieth as heavy as a Blue Whale
In other words, 2,100 kilograms is 0.0201 times the weight of a Blue Whale, and the weight of a Blue Whale is 49.80 times that amount.(Balaenoptera musculus)
Blue whales weigh between 73,000 and 136,000 kg. The largest mammal to have ever lived, blue whales feed almost exclusively on krill — tiny invertebrates weighing about 0.001 kilograms each.
It's about one-seventy-fifth as heavy as a House
In other words, the weight of a House is 74.10 times 2,100 kilograms.(149 sq. m, single-level, unfurnished)
A 149 sq. m (1,600 sq. ft), single-story, unfurnished house (without extensive masonry) of the type commonly found in America would weigh approximately 156,000 kg, based on the weight of the included materials. In contrast, a yurt — a type of dwelling structure popular among nomadic peoples of East Asia — typically weighs less than 458 kg.