india census, thirparappu (thriparappu) had a population of 21,722. males constitute 49% of the population and females 51%. thirparappu (thriparappu) has an average literacy rate of 75%, higher than the national average of 59.5%: male literacy is 78%, and female literacy is 72%. in thirparappu (thriparappu), 10% of the population is under 6 years of age.