16833421 has 4 divisors (see below), whose sum is σ = 18363744. Its totient is φ = 15303100.

The previous prime is 16833413. The next prime is 16833431. The reversal of 16833421 is 12433861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12433861 = 11 ⋅1130351.

It is a cyclic number.

It is not a de Polignac number, because 16833421 - 2³ = 16833413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16833421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16833431) 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 3 ways as a sum of consecutive naturals, for example, 765145 + ... + 765166.

It is an arithmetic number, because the mean of its divisors is an integer number (4590936).

Almost surely, 2^16833421 is an apocalyptic number.

16833421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16833421 is a deficient number, since it is larger than the sum of its proper divisors (1530323).

16833421 is a wasteful number, since it uses less digits than its factorization.

16833421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1530322.

The product of its digits is 3456, while the sum is 28.

The square root of 16833421 is about 4102.8552253278. The cubic root of 16833421 is about 256.2855547731.

The spelling of 16833421 in words is "sixteen million, eight hundred thirty-three thousand, four hundred twenty-one".