Question

$21436587$ is exactly divisible by ____ .

• A. $2$
• B. $5$
• C. $7$
• D. $9$

Answer 1

The correct option is D $9$

Given : $21436587$

Sum of Digits of Given Number $=2+1+4+3+6+5+8+7=36$

Divisibility Test for $9$ :

$\to$ A number is divisible by $9$ if the sum of the digits is divisible by $9$.

For Example,

$549$ is divisible by 9 since the sum of the digits is $18$ and $18$ is Divisible by $9$.

Here,

Given number is $21436587$ and Sum of its Digits is $36$ which is Divisible by $9$.

$\therefore 21436587$ is exactly divisible by $9$.