16821912 has 32 divisors (see below), whose sum is σ = 42393600. Its totient is φ = 5562144.

The previous prime is 16821907. The next prime is 16821913. The reversal of 16821912 is 21912861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 16821912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289 + ... + 5807.

It is an arithmetic number, because the mean of its divisors is an integer number (1324800).

Almost surely, 2^16821912 is an apocalyptic number.

16821912 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

16821912 is an abundant number, since it is smaller than the sum of its proper divisors (25571688).

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

16821912 is a wasteful number, since it uses less digits than its factorization.

16821912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5655 (or 5651 counting only the distinct ones).

The product of its digits is 1728, while the sum is 30.

The square root of 16821912 is about 4101.4524256658. The cubic root of 16821912 is about 256.2271340295.

The spelling of 16821912 in words is "sixteen million, eight hundred twenty-one thousand, nine hundred twelve".