16821198 has 24 divisors (see below), whose sum is σ = 36528336. Its totient is φ = 5594400.

The previous prime is 16821197. The next prime is 16821209. The reversal of 16821198 is 89112861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821191) 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, 10618 + ... + 12098.

It is an arithmetic number, because the mean of its divisors is an integer number (1522014).

Almost surely, 2^16821198 is an apocalyptic number.

16821198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16821198 is an abundant number, since it is smaller than the sum of its proper divisors (19707138).

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

16821198 is a wasteful number, since it uses less digits than its factorization.

16821198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120 (or 2117 counting only the distinct ones).

The product of its digits is 6912, while the sum is 36.

The square root of 16821198 is about 4101.3653824062. The cubic root of 16821198 is about 256.2235088220.

The spelling of 16821198 in words is "sixteen million, eight hundred twenty-one thousand, one hundred ninety-eight".