32 bits binary number

A positive integer less than 2^32 is given. This number can be represented by a 32-bit binary number (less than 32 bits with 0 complement). We call the first 16 bits of the binary number "high" and the last 16 bits "low." We can get a new number by exchanging its high and low positions. How much this new number is (in decimal notation).
For example, the number 1314520 is represented by a binary representation of 0000 0000 0001 0100 0000 1110 1101 1000 (added 11 leading 0 topping for 32 bits), where the first 16 bits are high, i.e. 0000 0000 0001 0100; the latter 16 bits are low, i.e. 0000 1 110 1101 1000. Swapping its high and low positions, we got a new binary number 0000 1110 1101 1000 0000 0000 0001 0100. It is the decimal 249036820.

Assuming this is an int (4 byte, 32 bit) type, then:

1 The original code: 00000000 00000000 00000000 00000001

32 bits binary number