16721324 has 24 divisors (see below), whose sum is σ = 30410688. Its totient is φ = 8038800.

The previous prime is 16721297. The next prime is 16721333. The reversal of 16721324 is 42312761.

It is a junction number, because it is equal to n+sod(n) for n = 16721293 and 16721302.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10799 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (1267112).

Almost surely, 2^16721324 is an apocalyptic number.

It is an amenable number.

16721324 is a deficient number, since it is larger than the sum of its proper divisors (13689364).

16721324 is a wasteful number, since it uses less digits than its factorization.

16721324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1565 (or 1563 counting only the distinct ones).

The product of its digits is 2016, while the sum is 26.

The square root of 16721324 is about 4089.1715542393. The cubic root of 16721324 is about 255.7154023145.

The spelling of 16721324 in words is "sixteen million, seven hundred twenty-one thousand, three hundred twenty-four".