16713221 has 16 divisors (see below), whose sum is σ = 19555200. Its totient is φ = 13989888.

The previous prime is 16713211. The next prime is 16713223. The reversal of 16713221 is 12231761.

16713221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 16713221 - 2¹⁸ = 16451077 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16713223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 86501 + ... + 86693.

It is an arithmetic number, because the mean of its divisors is an integer number (1222200).

Almost surely, 2^16713221 is an apocalyptic number.

It is an amenable number.

16713221 is a deficient number, since it is larger than the sum of its proper divisors (2841979).

16713221 is a wasteful number, since it uses less digits than its factorization.

16713221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428.

The product of its digits is 504, while the sum is 23.

The square root of 16713221 is about 4088.1806466936. The cubic root of 16713221 is about 255.6740898623.

Adding to 16713221 its reverse (12231761), we get a palindrome (28944982).

The spelling of 16713221 in words is "sixteen million, seven hundred thirteen thousand, two hundred twenty-one".