16721072 has 20 divisors (see below), whose sum is σ = 32948040. Its totient is φ = 8218368.

The previous prime is 16721063. The next prime is 16721087. The reversal of 16721072 is 27012761.

It is an alternating number because its digits alternate between odd and even.

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 3 ways as a sum of consecutive naturals, for example, 7913 + ... + 9800.

It is an arithmetic number, because the mean of its divisors is an integer number (1647402).

Almost surely, 2^16721072 is an apocalyptic number.

It is an amenable number.

16721072 is a deficient number, since it is larger than the sum of its proper divisors (16226968).

16721072 is a wasteful number, since it uses less digits than its factorization.

16721072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17780 (or 17774 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 16721072 is about 4089.1407410359. The cubic root of 16721072 is about 255.7141177151.

It can be divided in two parts, 1672 and 1072, that added together give a cube (2744 = 14³).

The spelling of 16721072 in words is "sixteen million, seven hundred twenty-one thousand, seventy-two".