There is no such number.
Suppose x were such a number. Then consider (x+12000)/2, the number halfway between x and 12000. It is easy to show that
So x could not have been the solution.
But using the same process you can find the number halfway between this number and 12000 which will still be less than 12000 and nearer still. This can go on forever, and you will never reach the closest.
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101. If you want a prime number less than 100, the closest is 97.
The closest prime number to 16, and less than 16, is 13. The closest prime number to 33, and greater than 33, is 37.
The closest whole number to 3/8 would be 1. It is less than the first whole number.
The closest prime number before 49 is 47. A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. In this case, 47 is the largest prime number less than 49, as it is not divisible by any other number except 1 and 47.
The integer/whole number closet to 0.1 is zero. If you can use decimal numbers, you will always be able to come up with a number closer to 0.1 than anyother number (exept 0.1 itself). For example 0.100000001 is very close to 0.1, but 0.10000000000000001 is even closer.