221102304 has 48 divisors (see below), whose sum is σ = 583792272. Its totient is φ = 73269248.

The previous prime is 221102303. The next prime is 221102341. The reversal of 221102304 is 403201122.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221102303) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9952 + ... + 23264.

It is an arithmetic number, because the mean of its divisors is an integer number (12162339).

Almost surely, 2^221102304 is an apocalyptic number.

221102304 is a gapful number since it is divisible by the number (24) 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 221102304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291896136).

221102304 is an abundant number, since it is smaller than the sum of its proper divisors (362689968).

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

221102304 is a wasteful number, since it uses less digits than its factorization.

221102304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13499 (or 13491 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221102304 is about 14869.5092050814. The cubic root of 221102304 is about 604.6876369462.

Adding to 221102304 its reverse (403201122), we get a palindrome (624303426).

The spelling of 221102304 in words is "two hundred twenty-one million, one hundred two thousand, three hundred four".