172121223 has 8 divisors (see below), whose sum is σ = 230111728. Its totient is φ = 114439104.

The previous prime is 172121203. The next prime is 172121227. The reversal of 172121223 is 322121271.

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

It is not a de Polignac number, because 172121223 - 2⁸ = 172120967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 172121223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172121227) 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, 75790 + ... + 78027.

It is an arithmetic number, because the mean of its divisors is an integer number (28763966).

Almost surely, 2^172121223 is an apocalyptic number.

172121223 is a deficient number, since it is larger than the sum of its proper divisors (57990505).

172121223 is a wasteful number, since it uses less digits than its factorization.

172121223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154193.

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

The square root of 172121223 is about 13119.4978181331. The cubic root of 172121223 is about 556.2603965906.

Adding to 172121223 its reverse (322121271), we get a palindrome (494242494).

The spelling of 172121223 in words is "one hundred seventy-two million, one hundred twenty-one thousand, two hundred twenty-three".