172190221 has 8 divisors (see below), whose sum is σ = 198043520. Its totient is φ = 146650608.

The previous prime is 172190219. The next prime is 172190237. The reversal of 172190221 is 122091271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172190221 - 2¹ = 172190219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172190621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77241 + ... + 79438.

It is an arithmetic number, because the mean of its divisors is an integer number (24755440).

Almost surely, 2^172190221 is an apocalyptic number.

It is an amenable number.

172190221 is a deficient number, since it is larger than the sum of its proper divisors (25853299).

172190221 is a wasteful number, since it uses less digits than its factorization.

172190221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156843.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 172190221 is about 13122.1271522570. The cubic root of 172190221 is about 556.3347157763.

The spelling of 172190221 in words is "one hundred seventy-two million, one hundred ninety thousand, two hundred twenty-one".