Thanks for your question
Can I clarify what you are asking for, as you ask after your social security number or tax fill number, but advise its in relation to the UK (which would make it tax reference number or National Insurance number)
can you give me a email address for national insurance number where I can get my number I need this number so I can get my pension form U.K
Thanks for your response
You cannot email for this, (the HMRC/Pension Service doe not support email requests unfortunately) but can either telephone or fill in form CA5403, the contact details are here
Just click on the link above.
However any P60 or payslip you have had, will detail this as well.