29 (the 10th prime)

 
Next prime31
Previous prime23
Octal(35)8
Hexadecimal(1D)16
Prime gap2
5th Twin prime (the small number)The big number is 19 .
4th Prime of the Form 4n+122 + 52
4th primorial prime5*3*2 - 1
6th Sophie Germain prime 
6th Right-truncatable prime