2Cor 12:2 I knew a man in Christ above fourteen years ago, (whether in the body, I cannot tell; or whether out of the body, I cannot tell: God knoweth

such an one caught up to the third heaven.
Was Paul referring to himself? If so, how do we know that?
Was he referring to some one else? If so, who (if that is known)?
Was he referring to Jesus at His Acsension?
Did Paul know this man? Or was it a vision? Or did he even know if it was real or a vision?
What is the 3rd Heaven?
And finally, the number 14? its significance in the Scriptures? Mentioned 24 times.