16221116 has 18 divisors (see below), whose sum is σ = 28749168. Its totient is φ = 8008320.

The previous prime is 16221113. The next prime is 16221119. The reversal of 16221116 is 61112261.

It is an interprime number because it is at equal distance from previous prime (16221113) and next prime (16221119).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16221113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37421 + ... + 37851.

It is an arithmetic number, because the mean of its divisors is an integer number (1597176).

Almost surely, 2^16221116 is an apocalyptic number.

It is an amenable number.

16221116 is a deficient number, since it is larger than the sum of its proper divisors (12528052).

16221116 is an equidigital number, since it uses as much as digits as its factorization.

16221116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 530 counting only the distinct ones).

The product of its digits is 144, while the sum is 20.

The square root of 16221116 is about 4027.5446614532. The cubic root of 16221116 is about 253.1396896622.

Adding to 16221116 its reverse (61112261), we get a palindrome (77333377).

The spelling of 16221116 in words is "sixteen million, two hundred twenty-one thousand, one hundred sixteen".