Briefly, his numerical analysis does not add up. To give you an example, 
he claimed that the first revelation was composed of 19 words, while it 
was composed of 20. You can count them for yourself:

  Iqraa bismi rabbika llathee khalaq. Khalaqa linsaana min 'alaq. Iqraa
warabuuka lakram. Allathee `allama bilqalam. `Allama linsaana maa lam

He also selectively counted the initial letters of some suras as letters
or as words.

Overview on numerical features in different scriptures
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