16808421 has 12 divisors (see below), whose sum is σ = 26070432. Its totient is φ = 9604728.

The previous prime is 16808419. The next prime is 16808431. The reversal of 16808421 is 12480861.

It is not a de Polignac number, because 16808421 - 2¹ = 16808419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16808431) 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 11 ways as a sum of consecutive naturals, for example, 57025 + ... + 57318.

It is an arithmetic number, because the mean of its divisors is an integer number (2172536).

Almost surely, 2^16808421 is an apocalyptic number.

It is an amenable number.

16808421 is a deficient number, since it is larger than the sum of its proper divisors (9262011).

16808421 is a wasteful number, since it uses less digits than its factorization.

16808421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114360 (or 114353 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 16808421 is about 4099.8074345023. The cubic root of 16808421 is about 256.1586185366.

It can be divided in two parts, 1680 and 8421, that added together give a palindrome (10101).

The spelling of 16808421 in words is "sixteen million, eight hundred eight thousand, four hundred twenty-one".