They all have four factors.
Gustaf von Numers was born on March 21, 1848, in Maksamaa, Finland.
111% of 21 = 111% * 21 = 1.11 * 21 = 23.31
90 + 21 = 111
111
111 x 20 = 2220
47 is a prime number 21 & 87 divisible by 3, and 4 is divisible by 2
If that's 11 and 121, the LCD is 121. If that's 111 and 21, the LCD is 777.
-111
Joseph Whitworth was born on 1803-12-21.
Nikolay Lvov died on 1803-12-21.
The Tonight Show with Jay Leno - 1992 21-111 was released on: USA: 18 March 2013
3 months and 21 days