16821120 has 64 divisors (see below), whose sum is σ = 53623440. Its totient is φ = 4485120.

The previous prime is 16821083. The next prime is 16821121. The reversal of 16821120 is 2112861.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16821121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2461 + ... + 6300.

Almost surely, 2^16821120 is an apocalyptic number.

16821120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16821120 is an abundant number, since it is smaller than the sum of its proper divisors (36802320).

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

16821120 is an equidigital number, since it uses as much as digits as its factorization.

16821120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8783 (or 8771 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 16821120 is about 4101.3558733668. The cubic root of 16821120 is about 256.2231127847.

Adding to 16821120 its reverse (2112861), we get a palindrome (18933981).

The spelling of 16821120 in words is "sixteen million, eight hundred twenty-one thousand, one hundred twenty".