Why is my NumberValue messing up at 100 Trillion?

I am trying to make a script to go up to like Quadrillion, and Quintilian but it messes up at 100 Trillion, can anyone help me with this?

Code:

local money = script.Parent.Parent["Money"]


while wait() do
	
	local val = math.abs(money.Value)
	local str = tostring(val)
	

	-- Trillions
	if val >=1e+14 then
		script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 4,4).."T+"
	elseif val >=1e+13 then
		script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."T+"
	elseif val >=1e+12 then
		script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."T+"
	-- Billions
	elseif val >=1e+11 then
		script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."B+"
	elseif val >=1e+10 then
		script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."B+"
	elseif val >=1e+9 then
		script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."B+"
	-- Millions
	elseif val >=1e+8 then
		script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."M+"
	elseif val >=1e+7 then
		script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."M+"
	elseif val >=1e+6 then
		script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."M+"
	-- Thousands
	elseif val >=1e+5 then
		script.Parent.Text = string.sub(str, 1,3).."."..string.sub(str, 3,3).."M+"
	elseif val >=1e+4 then
		script.Parent.Text = string.sub(str, 1,2).."."..string.sub(str, 3,3).."M+"
	elseif val >=1e+3 then
		script.Parent.Text = string.sub(str, 1,1).."."..string.sub(str, 2,2).."M+"
	-- Hundreds
	elseif val >=0 then
		script.Parent.Text = str
	end
end

ROBLOX uses a 32-bit platform which means ROBLOX Lua cannot hold numbers larger than 4,294,967,295. You are experiencing an integer overflow and there's no way around it as far as I know. Here is the Wikipedia entry if you want to understand what an Integer Overflow is https://en.wikipedia.org/wiki/Integer_overflow . Why do you even need that much money anyway?