16721120 has 48 divisors (see below), whose sum is σ = 42547680. Its totient is φ = 6173184.

The previous prime is 16721119. The next prime is 16721141. The reversal of 16721120 is 2112761.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 16721092 and 16721101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1940 + ... + 6099.

It is an arithmetic number, because the mean of its divisors is an integer number (886410).

Almost surely, 2^16721120 is an apocalyptic number.

16721120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16721120 is an abundant number, since it is smaller than the sum of its proper divisors (25826560).

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

16721120 is a wasteful number, since it uses less digits than its factorization.

16721120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8067 (or 8059 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 16721120 is about 4089.1466102354. The cubic root of 16721120 is about 255.7143624017.

Adding to 16721120 its reverse (2112761), we get a palindrome (18833881).

The spelling of 16721120 in words is "sixteen million, seven hundred twenty-one thousand, one hundred twenty".