173204021 has 4 divisors (see below), whose sum is σ = 173335872. Its totient is φ = 173072172.

The previous prime is 173204011. The next prime is 173204029. The reversal of 173204021 is 120402371.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 173204021 - 2²² = 169009717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 173203984 and 173204002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (173204029) 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 3 ways as a sum of consecutive naturals, for example, 63935 + ... + 66588.

It is an arithmetic number, because the mean of its divisors is an integer number (43333968).

Almost surely, 2^173204021 is an apocalyptic number.

It is an amenable number.

173204021 is a deficient number, since it is larger than the sum of its proper divisors (131851).

173204021 is a wasteful number, since it uses less digits than its factorization.

173204021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131850.

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

The square root of 173204021 is about 13160.6998674083. The cubic root of 173204021 is about 557.4244192283.

Adding to 173204021 its reverse (120402371), we get a palindrome (293606392).

The spelling of 173204021 in words is "one hundred seventy-three million, two hundred four thousand, twenty-one".