16821089 has 8 divisors (see below), whose sum is σ = 17091360. Its totient is φ = 16552800.

The previous prime is 16821083. The next prime is 16821121. The reversal of 16821089 is 98012861.

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 16821089 - 2¹² = 16816993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16821083) 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, 29174 + ... + 29744.

It is an arithmetic number, because the mean of its divisors is an integer number (2136420).

Almost surely, 2^16821089 is an apocalyptic number.

It is an amenable number.

16821089 is a deficient number, since it is larger than the sum of its proper divisors (270271).

16821089 is an equidigital number, since it uses as much as digits as its factorization.

16821089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 16821089 is about 4101.3520941270. The cubic root of 16821089 is about 256.2229553850. Note that the first 3 decimals are identical.

The spelling of 16821089 in words is "sixteen million, eight hundred twenty-one thousand, eighty-nine".