converting number to string in lisp -

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i tried find lisp function convert between numbers , strings , after little googling fond function same name. when entered (itoa 1) slime printed: 

undefined function itoa called arguments (1) .

how can conversion?

from number string:

(write-to-string 5) "5"

you may transform string numerical notation:

(write-to-string 341 :base 10) "341"

from string number:

(parse-integer "5") 5

with trash

(parse-integer " 5 not number" :junk-allowed t) 5

or use this:

(read-from-string "23 absd") 23

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