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The number 33 comes from the number of demi gods explained by Yajnavalkya in Brhadaranyaka Upanishad – the eight Vasus, the eleven Rudras, the twelve Adityas, Indra and Prajapati. (Chapter I, hymn 9, verse 2)

I made A mistake in my text and changed it to 33.000.000. Sorry my wrong. (Sri Brahma Samhita)

Thanks for you response!