Perhaps you should read the manual. OrderMagicNumber - Trade Functions - MQL4 Reference
How To Ask Questions The Smart Way. (2004)
How To Interpret Answers.
RTFM and STFW: How To Tell You've Seriously Screwed Up.
OrderMagicNumber() returns an int and INT_MAX is 2147483647.
Numerical Type Constants - Named Constants - Constants, Enumerations and Structures - MQL4 Reference
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What is the maximum value of a magic number?