221040324 has 72 divisors (see below), whose sum is σ = 600058368. Its totient is φ = 68355840.

The previous prime is 221040301. The next prime is 221040353. The reversal of 221040324 is 423040122.

221040324 is digitally balanced in base 2, 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 (18).

It is a junction number, because it is equal to n+sod(n) for n = 221040297 and 221040306.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40909 + ... + 45995.

It is an arithmetic number, because the mean of its divisors is an integer number (8334144).

Almost surely, 2^221040324 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 221040324, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (300029184).

221040324 is an abundant number, since it is smaller than the sum of its proper divisors (379018044).

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

221040324 is a wasteful number, since it uses less digits than its factorization.

221040324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5185 (or 5180 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 221040324 is about 14867.4249283459. The cubic root of 221040324 is about 604.6311291040.

Adding to 221040324 its reverse (423040122), we get a palindrome (644080446).

The spelling of 221040324 in words is "two hundred twenty-one million, forty thousand, three hundred twenty-four".