221108992 has 108 divisors (see below), whose sum is σ = 498490720. Its totient is φ = 97284096.

The previous prime is 221108989. The next prime is 221108999. The reversal of 221108992 is 299801122.

It is not an unprimeable number, because it can be changed into a prime (221108999) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2798809 + ... + 2798887.

Almost surely, 2^221108992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221108992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (249245360).

221108992 is an abundant number, since it is smaller than the sum of its proper divisors (277381728).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221108992 is an equidigital number, since it uses as much as digits as its factorization.

221108992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 123 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 221108992 is about 14869.7340931168. The cubic root of 221108992 is about 604.6937338375.

The spelling of 221108992 in words is "two hundred twenty-one million, one hundred eight thousand, nine hundred ninety-two".