221118830 has 32 divisors (see below), whose sum is σ = 424686240. Its totient is φ = 82600960.

The previous prime is 221118829. The next prime is 221118853. The reversal of 221118830 is 38811122.

It is a self number, because there is not a number n which added to its sum of digits gives 221118830.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17306 + ... + 27234.

It is an arithmetic number, because the mean of its divisors is an integer number (13271445).

Almost surely, 2^221118830 is an apocalyptic number.

221118830 is a deficient number, since it is larger than the sum of its proper divisors (203567410).

221118830 is a wasteful number, since it uses less digits than its factorization.

221118830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10084.

The product of its (nonzero) digits is 768, while the sum is 26.

The square root of 221118830 is about 14870.0648956217. The cubic root of 221118830 is about 604.7027020974.

Adding to 221118830 its reverse (38811122), we get a palindrome (259929952).

The spelling of 221118830 in words is "two hundred twenty-one million, one hundred eighteen thousand, eight hundred thirty".