Insert 9 one-digit numbers in the middle of the two-digit number 11 to obtain an eleven-digit number. The sum of the eleven-digit numbers is 11 and is a multiple of 11. How many such eleven-digit numbers are there?
在两位数11中间插入9个一位数字得到1个十一位数，该十一位数的数字和为11且是11的倍数，这样的十一位数共有多少个．
<gadget id="calculator">12 * 11 * 10</gadget>
<output>1_320</output>

<gadget id="calculator">1 * 2 * 3</gadget>
<output>6</output>

<gadget id="calculator">1_320 / 6</gadget>
<output>220</output>

<result>220</result>