It is already in Hindu-Arabic numerals but if you mean in Roman numerals then it is written as: CXXIII
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Do you mean 11,123,111 then if so it is:-((MC))(CXXIII)CXI because this is the equivalent in Hindu-Arabic numerals of:-(10,000*1,100)+(1,000*123)+111 which equals 11,123,111Note that Roman numerals in double brackets indicate multiplication by 10,000 whereas numerals in single brackets indicate multiplication by 1,000.QED
123 = CXXIII
123
123
Arabic numerals (the common 1,2,3,4, etc.) were decided upon independently by everyone because they are so much easier to manipulate.