21978 x 4 = 87912 (Eighty seven thousand nine hundred twelve)
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21978
21978
Let the five-digit number be represented as ( x ). We need to find ( x ) such that ( 4x ) equals the reverse of ( x ). We can express ( x ) as ( 10^4a + 10^3b + 10^2c + 10d + e ) (where ( a, b, c, d, e ) are the digits of ( x )), then ( 4x ) becomes ( 4(10^4a + 10^3b + 10^2c + 10d + e) ). After exploring possible five-digit values, the number ( 21978 ) satisfies the condition because ( 4 \times 21978 = 87912 ), which is indeed ( 21978 ) with its digits reversed.
1024.
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