172285221 has 16 divisors (see below), whose sum is σ = 237254400. Its totient is φ = 111141888.

The previous prime is 172285193. The next prime is 172285229. The reversal of 172285221 is 122582271.

It is not a de Polignac number, because 172285221 - 2¹⁰ = 172284197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172285229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5685 + ... + 19413.

It is an arithmetic number, because the mean of its divisors is an integer number (14828400).

Almost surely, 2^172285221 is an apocalyptic number.

It is an amenable number.

172285221 is a deficient number, since it is larger than the sum of its proper divisors (64969179).

172285221 is a wasteful number, since it uses less digits than its factorization.

172285221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868.

The product of its digits is 4480, while the sum is 30.

The square root of 172285221 is about 13125.7464930571. The cubic root of 172285221 is about 556.4370097799.

The spelling of 172285221 in words is "one hundred seventy-two million, two hundred eighty-five thousand, two hundred twenty-one".