How about 2 times 126 = 252 as one example
6 and 42
2 x 2 x 3 x 3 x 7 = 252
252
252/12 = 21
2x2x3x3x7=252
1 and 252, 2 and 126, 3 and 84, 6 and 42, 7 and 36, 9 and 28, 12 and 21, 14 and 18.
The numbers for the vertebrates are 252.
252
12 and 252
252 centimeters is 99.21 inches.
2 / 252 is equal to ~0.007937