format number

Hi,

I get numbers such as 

1
212
2121

from <xsl:number>.

I need these numbers to be 10 digits, with numbers padded with trailing
zeros:

1000000000
2120000000
2121000000

I can get leading zeros, but not trailing, and any attempt to multiply 

<xsl:text>0.<xsl:number/>

by 1000000000 (if you get what I mean) even after using number() I still
get NaN :(

whats the best way of doing this?

cheers
andrew

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