Correct answer is... 17221 kg. It is equal to 37965 lbs. Empty weight of Stroukoff YC-134 is total weight of the airframe, engine, avionics and all other systems installed by manufacturer.
The biggest civil aircraft has empty weight of 250,000 kg (628,000 lb), so Stroukoff YC-134 has 7% percent of it's weight. Typical jet airliner has about 39,500 kg (87,100 lb), so in the comparision Stroukoff YC-134 has 44% of aircrafts like B737 or A320.
Disclaimer: Our articles and data connected to empty weight of Stroukoff YC-134 are based on public data from various sources. We are very picky to select an reliable data providers, but we cannot guarantee that everything is 100% error-proof. We recommend for any serious purpose - as a rule of thumb - to request offical data about empty weight from manufacturer of Stroukoff YC-134.