Fatto generale: 210 is the world speed record (km/h) for a mountain bike on a ski slope.
Fatto matematico: 210 is a composite number, an abundant number, and the product of the first four prime numbers (2, 3, 5, and 7), and thus a primorial.
Trivia: 210 is the world speed record (km/h) for a mountain bike on a ski slope.
Data storica: July 28th is the day in 1957 that Heavy rain and a mudslide in Isahaya, western Kyūshū, Japan, kill 992.