COUNTER64 Error

Hi All,
    I am using ASN_COUNTER64 as type in the function 'snmp_set_var_typed_value' the value is of type "unsigned long long int" but the manager is i.e snmpget/snmpgetnext is displaying large value.

sample implemntation is 

unsigned long long int lval = 0;
lval = 21;
snmp_set_var_typed_value(request->requestvb, ASN_COUNTER64,
                                        (u_char *)&lval,
                                        sizeof(lval));

The output is:

txrxframes127.4900010.1 = Counter64: 133143986176

But the expected out put is 21.

Rgards,
Sasikumar.