Gateway of last resort - quick question

We have a few remote sites connected to us via mpls. The users there can get to the internet (their traffic goes through headquarters)

Why is the gateway of last resort set the way it is? I inherited this network and my manager was unable to give me an answer. I'm trying to figure this out, because this router is unable to synch with an ntp server. It can't even ping it.

Thanks

Gateway of last resort is 0.0.0.0 to network 0.0.0.0
 
     172.16.0.0/24 is subnetted, 3 subnets
C       172.16.21.0 is directly connected, FastEthernet0/0.1
C       172.16.22.0 is directly connected, FastEthernet0/0.22
S       172.16.10.0 [1/0] via 63.238.106.222
     63.0.0.0/8 is variably subnetted, 3 subnets, 2 masks
C       63.238.106.180/30 is directly connected, Serial0/0
C       63.238.106.181/32 is directly connected, Serial0/0
S       63.238.106.222/32 [1/0] via 63.238.106.181
S*   0.0.0.0/0 is directly connected, Serial0/0
c2621XM-BR#

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