16896721 has 8 divisors (see below), whose sum is σ = 17472224. Its totient is φ = 16329600.

The previous prime is 16896713. The next prime is 16896727. The reversal of 16896721 is 12769861.

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 16896721 - 2³ = 16896713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16896727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2146 + ... + 6196.

It is an arithmetic number, because the mean of its divisors is an integer number (2184028).

Almost surely, 2^16896721 is an apocalyptic number.

It is an amenable number.

16896721 is a deficient number, since it is larger than the sum of its proper divisors (575503).

16896721 is an equidigital number, since it uses as much as digits as its factorization.

16896721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4191.

The product of its digits is 36288, while the sum is 40.

The square root of 16896721 is about 4110.5621270089. The cubic root of 16896721 is about 256.6063963355.

The spelling of 16896721 in words is "sixteen million, eight hundred ninety-six thousand, seven hundred twenty-one".