821327172 has 12 divisors (see below), whose sum is σ = 1916430096. Its totient is φ = 273775720.

The previous prime is 821327159. The next prime is 821327189. The reversal of 821327172 is 271723128.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34221954 + ... + 34221977.

It is an arithmetic number, because the mean of its divisors is an integer number (159702508).

Almost surely, 2^821327172 is an apocalyptic number.

It is an amenable number.

821327172 is an abundant number, since it is smaller than the sum of its proper divisors (1095102924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

821327172 is a wasteful number, since it uses less digits than its factorization.

821327172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68443938 (or 68443936 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 821327172 is about 28658.8061858829. The cubic root of 821327172 is about 936.4948575820.

The spelling of 821327172 in words is "eight hundred twenty-one million, three hundred twenty-seven thousand, one hundred seventy-two".