221324304440 has 32 divisors (see below), whose sum is σ = 499739356080. Its totient is φ = 88216891392.

The previous prime is 221324304413. The next prime is 221324304473. The reversal of 221324304440 is 44403423122.

221324304440 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9764489 + ... + 9787128.

Almost surely, 2^221324304440 is an apocalyptic number.

221324304440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221324304440 is an abundant number, since it is smaller than the sum of its proper divisors (278415051640).

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

221324304440 is a wasteful number, since it uses less digits than its factorization.

221324304440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19551911 (or 19551907 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 221324304440 its reverse (44403423122), we get a palindrome (265727727562).

The spelling of 221324304440 in words is "two hundred twenty-one billion, three hundred twenty-four million, three hundred four thousand, four hundred forty".