16870321 has 8 divisors (see below), whose sum is σ = 18555264. Its totient is φ = 15240720.

The previous prime is 16870313. The next prime is 16870327. The reversal of 16870321 is 12307861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16870321 - 2³ = 16870313 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16870321.

It is not an unprimeable number, because it can be changed into a prime (16870327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13195 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (2319408).

Almost surely, 2^16870321 is an apocalyptic number.

It is an amenable number.

16870321 is a deficient number, since it is larger than the sum of its proper divisors (1684943).

16870321 is a wasteful number, since it uses less digits than its factorization.

16870321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27671.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 16870321 is about 4107.3496320620. The cubic root of 16870321 is about 256.4726832102.

The spelling of 16870321 in words is "sixteen million, eight hundred seventy thousand, three hundred twenty-one".