4173221 has 4 divisors (see below), whose sum is σ = 4494252. Its totient is φ = 3852192.

The previous prime is 4173209. The next prime is 4173223. The reversal of 4173221 is 1223714.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2102500 + 2070721 = 1450^2 + 1439^2 .

It is a cyclic number.

It is not a de Polignac number, because 4173221 - 2¹⁸ = 3911077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4173193 and 4173202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4173223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160496 + ... + 160521.

It is an arithmetic number, because the mean of its divisors is an integer number (1123563).

Almost surely, 2^4173221 is an apocalyptic number.

It is an amenable number.

4173221 is a deficient number, since it is larger than the sum of its proper divisors (321031).

4173221 is a wasteful number, since it uses less digits than its factorization.

4173221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321030.

The product of its digits is 336, while the sum is 20.

The square root of 4173221 is about 2042.8462986725. The cubic root of 4173221 is about 160.9992284211. Note that the first 3 decimals are identical.

Adding to 4173221 its reverse (1223714), we get a palindrome (5396935).

The spelling of 4173221 in words is "four million, one hundred seventy-three thousand, two hundred twenty-one".