Numbers with decimals can't be whole numbers.
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The answer is 136
134 or 136
136.3333
21 goes into 136 six times. This can be calculated by dividing 136 by 21, which equals 6 with a remainder of 10. Since we are looking for the whole number of times 21 goes into 136, we ignore the remainder.
136 is not prime. 136 = 2 * 2 * 2 * 17