Preserve leading zero on Excel

Hi Guys,

I have made a query to export to excel from SAP. The query lists bar codes and many have leading zeros e.g. 000521201241231452 or 0021335124

I require the leading 000 as i am planning to upload barcodes onto SAP UDF field en mass. However after export to excel, it is displayed as the below.

I am aware of the format cell --> text or custom type --> entering 00000.

However i have some fields which are 10, 12, 15 numbers and this is causing to miss out some of the leading zeros.  I require the EXACT bar codes with the correct leading zeros.

Can someone advise on the best course of action?

thanks