ADS131M02: How to connect the NC Pins

Tool/software:

Hi TI-Team,
Could you please help with the NC Pins on the ADS131M02. The datasheet does mention what to do with unsed Pins:

9.1.1 Unused Inputs and Outputs
Leave any unused analog inputs floating or connect them to AGND.
Do not float unused digital inputs because excessive power-supply leakage current can result. Tie all unused
digital inputs to the appropriate levels, DVDD or DGND. Leave the DRDY pin unconnected or connect it to
DVDD using a weak pullup resistor if unused.

Are the NC Pins analog or digital Pins?
Can you please tell me how to connect them or if it is ok to not connect them.

Thanks a lot!