Verse 156

षट्शतानि दिवा रात्रौ सहस्राण्येकविंशतिः ।जपो देव्याः समुद्दिष्टः सुलभो दुर्लभो जडैः

In plain words

Twenty-one thousand and six hundred, by day and by night: this is declared the of the Goddess, easy to reach, and hard to reach for the dull.