221116604 has 12 divisors (see below), whose sum is σ = 407320200. Its totient is φ = 104739408.

The previous prime is 221116591. The next prime is 221116607. The reversal of 221116604 is 406611122.

It is a self number, because there is not a number n which added to its sum of digits gives 221116604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221116607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454639 + ... + 1454790.

It is an arithmetic number, because the mean of its divisors is an integer number (33943350).

Almost surely, 2^221116604 is an apocalyptic number.

It is an amenable number.

221116604 is a deficient number, since it is larger than the sum of its proper divisors (186203596).

221116604 is a wasteful number, since it uses less digits than its factorization.

221116604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2909452 (or 2909450 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 221116604 is about 14869.9900470713. The cubic root of 221116604 is about 604.7006729129.

Adding to 221116604 its reverse (406611122), we get a palindrome (627727726).

The spelling of 221116604 in words is "two hundred twenty-one million, one hundred sixteen thousand, six hundred four".