210

210 is a number following 209 and preceding 211. It's the largest number that is both a and a .
== Properties ==
210 is an even composite number (16 divisors).
210 is also an abundant number.
210 is the product of the single-digit s. Because of this fact, 210 is also equal to 7# (primorial). It's also the sum of 8 primes from 13 to 41.
210 is the second largest number, that is both a triangular and pentagonal number. The third is 40,755.
Its prime factorization is 2 × 3 × 5 × 7.https://en.wikipedia.org/wiki/210_(number)
== In calendars ==
 has a period of 210 days.
== In googology ==
210 is called “end run” by André Joyce.http://michaelhalm.tripod.com/id76.html
210 is called "Heads-Tetprimol" or "Tails-Tetprimol" by Licorneuhh. It is equal to R(4) and Я(4) using Primarial Functions.Numbers | Licorneuhh's numbers site (retrieved at UTC 19:17 16/12/2020) 
3210 is the first power of 3 larger than a googol.
== Sources ==
Category:Numbers
Category:Calendar-related numbers
Category:Class 1
Category:Numbers with 3 digits
Category:Primorial numbers