The actual numbers will be in the 2021 SEC filing. We should see that early next year. The valuation of a private company includes things other than the stock price times the number of shares. (Used for publicly traded companies) All will be listed in the SEC filing.
If interested, you can look on the NACVA site, one of two prominent organizations that have a recognized process for valuing privately held companies. NACVA.com
Was at one time certified to do this work but became too much of struggle to maintain the credential. The other organization is the American Institute of Certified Public Accountants. (AICPA)
Understanding the process will give you a greater appreciation for what Aptera management have done with the current instantiation of the company.
For our purposes (Not preparing for going public) the 500Million is OK.