171221232 has 80 divisors (see below), whose sum is σ = 544409600. Its totient is φ = 45156096.

The previous prime is 171221221. The next prime is 171221261. The reversal of 171221232 is 232122171.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 171221199 and 171221208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15232 + ... + 23967.

It is an arithmetic number, because the mean of its divisors is an integer number (6805120).

Almost surely, 2^171221232 is an apocalyptic number.

171221232 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

171221232 is an abundant number, since it is smaller than the sum of its proper divisors (373188368).

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

171221232 is a wasteful number, since it uses less digits than its factorization.

171221232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39230 (or 39224 counting only the distinct ones).

The product of its digits is 336, while the sum is 21.

The square root of 171221232 is about 13085.1531133571. The cubic root of 171221232 is about 555.2891732236.

The spelling of 171221232 in words is "one hundred seventy-one million, two hundred twenty-one thousand, two hundred thirty-two".