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Returns or sets a Variant value that represents the format code for the object. expression .NumberFormat. expression A variable that represents a Range object. This property returns Null if all cells in the specified range don't have the same number format. The format code is the same string as the Format Codes option in the Format Cells dialog box. The Format function uses different format code strings than do the NumberFormat and NumberFormatLocal properties.
Excel only allows up to 15 significant digits so a 22-digit number can only be represented in Excel as a text value, hence you can't use number formatting. To get the required result in another cell you can use REPLACE function to add a space at character 7, i.e. =REPLACE(A1,7,0, )