170842321 has 16 divisors (see below), whose sum is σ = 196084224. Its totient is φ = 147622464.

The previous prime is 170842297. The next prime is 170842337. The reversal of 170842321 is 123248071.

170842321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 170842321 - 2¹⁵ = 170809553 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 170842321.

It is not an unprimeable number, because it can be changed into a prime (170842351) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7975 + ... + 20131.

It is an arithmetic number, because the mean of its divisors is an integer number (12255264).

Almost surely, 2^170842321 is an apocalyptic number.

It is an amenable number.

170842321 is a deficient number, since it is larger than the sum of its proper divisors (25241903).

170842321 is a wasteful number, since it uses less digits than its factorization.

170842321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12240.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 170842321 is about 13070.6664328947. Note that the first 3 decimals coincide. The cubic root of 170842321 is about 554.8792540938.

The spelling of 170842321 in words is "one hundred seventy million, eight hundred forty-two thousand, three hundred twenty-one".