16443321 has 16 divisors (see below), whose sum is σ = 23030784. Its totient is φ = 10415504.

The previous prime is 16443313. The next prime is 16443331. The reversal of 16443321 is 12334461.

It is not a de Polignac number, because 16443321 - 2³ = 16443313 is a prime.

It is a super-3 number, since 3×16443321³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16443291 and 16443300.

It is not an unprimeable number, because it can be changed into a prime (16443311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10810 + ... + 12236.

It is an arithmetic number, because the mean of its divisors is an integer number (1439424).

Almost surely, 2^16443321 is an apocalyptic number.

It is an amenable number.

16443321 is a deficient number, since it is larger than the sum of its proper divisors (6587463).

16443321 is a wasteful number, since it uses less digits than its factorization.

16443321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1620.

The product of its digits is 1728, while the sum is 24.

The square root of 16443321 is about 4055.0364979862. The cubic root of 16443321 is about 254.2903297658.

Adding to 16443321 its reverse (12334461), we get a palindrome (28777782).

The spelling of 16443321 in words is "sixteen million, four hundred forty-three thousand, three hundred twenty-one".