library(survey)
# install and load the survey package
options(survey.lonely.psu="adjust") 
# to fix the issue with strata with single PSU
# adjust will center the stratum at the population mean

data$wt = data$v005/1000000
# create the weight variable

mydesign<-svydesign(id=data$v021, data=data, strata=data$v023,  weight=data$wt, nest=T)
# set the survey design using the uploaded data (named data), the cluster (v021), the strata (v023) , and the weight (wt).
# then use svymean or svytable to get the weighted proportions and frequencies of your variables.  See the survey package documentation for further details.