16721227 has 4 divisors (see below), whose sum is σ = 16833600. Its totient is φ = 16608856.

The previous prime is 16721213. The next prime is 16721239. The reversal of 16721227 is 72212761.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16721227 - 2¹¹ = 16719179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16721195 and 16721204.

It is not an unprimeable number, because it can be changed into a prime (16721267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55963 + ... + 56260.

It is an arithmetic number, because the mean of its divisors is an integer number (4208400).

Almost surely, 2^16721227 is an apocalyptic number.

16721227 is a deficient number, since it is larger than the sum of its proper divisors (112373).

16721227 is a wasteful number, since it uses less digits than its factorization.

16721227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112372.

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

The square root of 16721227 is about 4089.1596936290. The cubic root of 16721227 is about 255.7149078472.

Adding to 16721227 its reverse (72212761), we get a palindrome (88933988).

The spelling of 16721227 in words is "sixteen million, seven hundred twenty-one thousand, two hundred twenty-seven".