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In reality, it's not. 2,147,483,647 is the largest number that an int type can hold. This is because Java uses a 32-bit signed integer value for ints. Since it's signed, one bit needs to hold the sign value, leaving us 31 bits for storage. 231 = 2,147,483,648, which is the total number of values which can be held in 31 bits. Since we also need to store a zero, our maximum is 2,147,483,647. The total range of data which can be held in an int is [-2,147,483,648 : 2,147,483,647].
But, as was said above, this is not the biggest number Java can handle. It also has support for 64-bit long integer types. This type can hold values in the range [-9,223,372,036,854,775,808 : 9,223,372,036,854,775,807].
And finally we have the BigInteger class, which can hold infinitely large numbers, limited only by the physical capacity of your storage space (RAM).
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