In the Global Economic Power Index, Tokyo ranked first.
=== Sister cities and states ===As of 2022, Tokyo has twinning or friendship agreements with the following twelve cities and states:=== Friendship and cooperation agreements ===Tomsk Oblast, Russia (since May 2015)Brussels, Belgium (since October 2016)Mumbai, India (since November 2016)Los Angeles County, United States (since August 2021)=== International academic and scientific research ===Research and development in Japan and the Japanese space program are globally represented by several of Tokyo's medical and scientific facilities, including the University of Tokyo and other universities in Tokyo, which work in collaboration with many international institutions
 Tokyo features two distinctive towers: Tokyo Tower and Tokyo Skytree, the latter of which is the tallest tower in both Japan and the world, and the second tallest structure in the world after the Burj Khalifa in Dubai

