Although you could certainly start a day of Sum Fun at the posted coordinates, the cache is NOT hidden there. To determine the actual coordinates for the cache simply add the following numbers. Your calculator probably won't be of much help.
421509512600257
113708731020083
445515300250066
294009620000124
220106102130298
114009320800064
542819400080449
377907111201022
200709210110385
340529503000029
101204420040158
+ 161305102100398
This is a log only cache. Please bring your own pen.
You can validate your puzzle solution with certitude.