173042221 has 12 divisors (see below), whose sum is σ = 193435200. Its totient is φ = 154638440.

The previous prime is 173042213. The next prime is 173042251. The reversal of 173042221 is 122240371.

It is not a de Polignac number, because 173042221 - 2³ = 173042213 is a prime.

It is a super-2 number, since 2×173042221² = 59887220497225682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 173042192 and 173042201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173042251) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4981 + ... + 19258.

It is an arithmetic number, because the mean of its divisors is an integer number (16119600).

Almost surely, 2^173042221 is an apocalyptic number.

173042221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

173042221 is a deficient number, since it is larger than the sum of its proper divisors (20392979).

173042221 is a wasteful number, since it uses less digits than its factorization.

173042221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24320 (or 24309 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 173042221 is about 13154.5513416460. The cubic root of 173042221 is about 557.2507909076.

Adding to 173042221 its reverse (122240371), we get a palindrome (295282592).

The spelling of 173042221 in words is "one hundred seventy-three million, forty-two thousand, two hundred twenty-one".