16016221 has 16 divisors (see below), whose sum is σ = 18471040. Its totient is φ = 13763520.

The previous prime is 16016219. The next prime is 16016233. The reversal of 16016221 is 12261061.

It is a cyclic number.

It is not a de Polignac number, because 16016221 - 2¹ = 16016219 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16016201) 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, 14536 + ... + 15598.

It is an arithmetic number, because the mean of its divisors is an integer number (1154440).

Almost surely, 2^16016221 is an apocalyptic number.

It is an amenable number.

16016221 is a deficient number, since it is larger than the sum of its proper divisors (2454819).

16016221 is a wasteful number, since it uses less digits than its factorization.

16016221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 16016221 is about 4002.0271113524. The cubic root of 16016221 is about 252.0693361321.

Adding to 16016221 its reverse (12261061), we get a palindrome (28277282).

The spelling of 16016221 in words is "sixteen million, sixteen thousand, two hundred twenty-one".