173380921 has 4 divisors (see below), whose sum is σ = 198149632. Its totient is φ = 148612212.

The previous prime is 173380919. The next prime is 173380951. The reversal of 173380921 is 129083371.

173380921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 173380921 - 2¹ = 173380919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (173380951) 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, 12384345 + ... + 12384358.

It is an arithmetic number, because the mean of its divisors is an integer number (49537408).

Almost surely, 2^173380921 is an apocalyptic number.

It is an amenable number.

173380921 is a deficient number, since it is larger than the sum of its proper divisors (24768711).

173380921 is an equidigital number, since it uses as much as digits as its factorization.

173380921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24768710.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 173380921 is about 13167.4189194390. The cubic root of 173380921 is about 557.6141277339.

The spelling of 173380921 in words is "one hundred seventy-three million, three hundred eighty thousand, nine hundred twenty-one".