221147888 has 40 divisors (see below), whose sum is σ = 464814000. Its totient is φ = 101320704.

The previous prime is 221147869. The next prime is 221147909. The reversal of 221147888 is 888741122.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25088 + ... + 32736.

It is an arithmetic number, because the mean of its divisors is an integer number (11620350).

Almost surely, 2^221147888 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 221147888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (232407000).

221147888 is an abundant number, since it is smaller than the sum of its proper divisors (243666112).

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

221147888 is a wasteful number, since it uses less digits than its factorization.

221147888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7809 (or 7803 counting only the distinct ones).

The product of its digits is 57344, while the sum is 41.

The square root of 221147888 is about 14871.0419271818. The cubic root of 221147888 is about 604.7291896373.

The spelling of 221147888 in words is "two hundred twenty-one million, one hundred forty-seven thousand, eight hundred eighty-eight".