16965421 has 8 divisors (see below), whose sum is σ = 19312704. Its totient is φ = 14752320.

The previous prime is 16965409. The next prime is 16965427. The reversal of 16965421 is 12456961.

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

It is not a de Polignac number, because 16965421 - 2¹⁵ = 16932653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16965427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33276 + ... + 33781.

It is an arithmetic number, because the mean of its divisors is an integer number (2414088).

Almost surely, 2^16965421 is an apocalyptic number.

16965421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16965421 is a deficient number, since it is larger than the sum of its proper divisors (2347283).

16965421 is a wasteful number, since it uses less digits than its factorization.

16965421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67091.

The product of its digits is 12960, while the sum is 34.

The square root of 16965421 is about 4118.9101713924. The cubic root of 16965421 is about 256.9537027940.

It can be divided in two parts, 1696 and 5421, that added together give a palindrome (7117).

The spelling of 16965421 in words is "sixteen million, nine hundred sixty-five thousand, four hundred twenty-one".