221123232 has 144 divisors (see below), whose sum is σ = 691262208. Its totient is φ = 66493440.

The previous prime is 221123213. The next prime is 221123251. The reversal of 221123232 is 232321122.

It is an interprime number because it is at equal distance from previous prime (221123213) and next prime (221123251).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 706308 + ... + 706620.

It is an arithmetic number, because the mean of its divisors is an integer number (4800432).

Almost surely, 2^221123232 is an apocalyptic number.

221123232 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 221123232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (345631104).

221123232 is an abundant number, since it is smaller than the sum of its proper divisors (470138976).

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

221123232 is a wasteful number, since it uses less digits than its factorization.

221123232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563 (or 552 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 221123232 is about 14870.2129103789. The cubic root of 221123232 is about 604.7067148472.

Adding to 221123232 its reverse (232321122), we get a palindrome (453444354).

The spelling of 221123232 in words is "two hundred twenty-one million, one hundred twenty-three thousand, two hundred thirty-two".