16159221 has 12 divisors (see below), whose sum is σ = 25136748. Its totient is φ = 9944064.

The previous prime is 16159217. The next prime is 16159237. The reversal of 16159221 is 12295161.

It can be written as a sum of positive squares in 2 ways, for example, as 3944196 + 12215025 = 1986^2 + 3495^2 .

It is not a de Polignac number, because 16159221 - 2² = 16159217 is a prime.

It is a super-2 number, since 2×16159221² = 522240846653682, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16159201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68940 + ... + 69173.

It is an arithmetic number, because the mean of its divisors is an integer number (2094729).

Almost surely, 2^16159221 is an apocalyptic number.

It is an amenable number.

16159221 is a deficient number, since it is larger than the sum of its proper divisors (8977527).

16159221 is a wasteful number, since it uses less digits than its factorization.

16159221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138132 (or 138129 counting only the distinct ones).

The product of its digits is 1080, while the sum is 27.

The square root of 16159221 is about 4019.8533555343. The cubic root of 16159221 is about 252.8173104517.

The spelling of 16159221 in words is "sixteen million, one hundred fifty-nine thousand, two hundred twenty-one".