General fact: 7210 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Mathematical fact: 7210 is an uninteresting number.
Trivia: 7210 is an uninteresting number.
Historical date: September 27th is the day in 2008 that CNSA astronaut Zhai Zhigang becomes the first Chinese person to perform a spacewalk while flying on Shenzhou 7.