16721272 has 8 divisors (see below), whose sum is σ = 31352400. Its totient is φ = 8360632.

The previous prime is 16721267. The next prime is 16721279. The reversal of 16721272 is 27212761.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

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

It is a self number, because there is not a number n which added to its sum of digits gives 16721272.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1045072 + ... + 1045087.

It is an arithmetic number, because the mean of its divisors is an integer number (3919050).

Almost surely, 2^16721272 is an apocalyptic number.

It is an amenable number.

16721272 is a deficient number, since it is larger than the sum of its proper divisors (14631128).

16721272 is a wasteful number, since it uses less digits than its factorization.

16721272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090165 (or 2090161 counting only the distinct ones).

The product of its digits is 2352, while the sum is 28.

The square root of 16721272 is about 4089.1651959783. The cubic root of 16721272 is about 255.7151372395.

The spelling of 16721272 in words is "sixteen million, seven hundred twenty-one thousand, two hundred seventy-two".