16821308 has 36 divisors (see below), whose sum is σ = 36053640. Its totient is φ = 6828192.

The previous prime is 16821269. The next prime is 16821319. The reversal of 16821308 is 80312861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1466 + ... + 5982.

It is an arithmetic number, because the mean of its divisors is an integer number (1001490).

Almost surely, 2^16821308 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16821308, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18026820).

16821308 is an abundant number, since it is smaller than the sum of its proper divisors (19232332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16821308 is a wasteful number, since it uses less digits than its factorization.

16821308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 16821308 is about 4101.3787925526. The cubic root of 16821308 is about 256.2240673340.

The spelling of 16821308 in words is "sixteen million, eight hundred twenty-one thousand, three hundred eight".