0.0000000000000000000000000000009999999999999999 G
1 z (zepto) is equal to 0.0000000000000000000000000000009999999999999999 G (giga). To convert from zepto to giga, multiply by 0.000000000000000000000000000001 or divide by 999,999,999,999,999,900,000,000,000,000.