221115888 has 60 divisors (see below), whose sum is σ = 707223088. Its totient is φ = 63175680.

The previous prime is 221115883. The next prime is 221115907. The reversal of 221115888 is 888511122.

221115888 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221115883) 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 11 ways as a sum of consecutive naturals, for example, 108673 + ... + 110688.

Almost surely, 2^221115888 is an apocalyptic number.

221115888 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

221115888 is an abundant number, since it is smaller than the sum of its proper divisors (486107200).

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

221115888 is a wasteful number, since it uses less digits than its factorization.

221115888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219382 (or 219373 counting only the distinct ones).

The product of its digits is 10240, while the sum is 36.

The square root of 221115888 is about 14869.9659717163. The cubic root of 221115888 is about 604.7000202163.

The spelling of 221115888 in words is "two hundred twenty-one million, one hundred fifteen thousand, eight hundred eighty-eight".