171221040 has 100 divisors (see below), whose sum is σ = 594698544. Its totient is φ = 45657216.

The previous prime is 171221033. The next prime is 171221051. The reversal of 171221040 is 40122171.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6732 + ... + 19691.

Almost surely, 2^171221040 is an apocalyptic number.

171221040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

171221040 is an abundant number, since it is smaller than the sum of its proper divisors (423477504).

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

171221040 is a wasteful number, since it uses less digits than its factorization.

171221040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26448 (or 26433 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 171221040 is about 13085.1457767959. The cubic root of 171221040 is about 555.2889656645.

The spelling of 171221040 in words is "one hundred seventy-one million, two hundred twenty-one thousand, forty".