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The binary number 10101 represents 21.
10101
10101
To determine if 10101 is divisible by a certain number, we can use the rules of divisibility. For example, to check if 10101 is divisible by 2, we look at the last digit, which is 1 (an odd number), so it is not divisible by 2. To check if it is divisible by 3, we add up the digits (1+0+1+0+1 = 3), and since the sum is divisible by 3, 10101 is divisible by 3. Similarly, we can apply rules for other numbers like 5, 7, etc., to determine their divisibility.
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