21224340324 has 72 divisors (see below), whose sum is σ = 59329556832. Its totient is φ = 6343505280.

The previous prime is 21224340311. The next prime is 21224340331. The reversal of 21224340324 is 42304342212.

21224340324 is a `hidden beast` number, since 2 + 12 + 243 + 403 + 2 + 4 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338194 + ... + 396009.

Almost surely, 2^21224340324 is an apocalyptic number.

It is an amenable number.

21224340324 is an abundant number, since it is smaller than the sum of its proper divisors (38105216508).

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

21224340324 is a wasteful number, since it uses less digits than its factorization.

21224340324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734297 (or 734292 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21224340324 its reverse (42304342212), we get a palindrome (63528682536).

The spelling of 21224340324 in words is "twenty-one billion, two hundred twenty-four million, three hundred forty thousand, three hundred twenty-four".