The length, width, and height of a cuboid are all two-digit numbers (the value of the length is the largest), and their sum is an even number. If the volume of this cuboid is one of the four numbers 2772, 2380, 3261, and 4125, what is the length of the cuboid?
一个长方体的长、宽、高都是两位数(其中长的值最大)，并且它们的和是偶数．若这个长方体的体积是2772、2380、3261、4125这四个数中的一个，则长方体的长是多少．
<result>21</result>