21243013324 has 24 divisors (see below), whose sum is σ = 40148357760. Its totient is φ = 9776684544.

The previous prime is 21243013303. The next prime is 21243013343. The reversal of 21243013324 is 42331034212.

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 7 ways as a sum of consecutive naturals, for example, 560284 + ... + 596995.

It is an arithmetic number, because the mean of its divisors is an integer number (1672848240).

Almost surely, 2^21243013324 is an apocalyptic number.

It is an amenable number.

21243013324 is a deficient number, since it is larger than the sum of its proper divisors (18905344436).

21243013324 is a wasteful number, since it uses less digits than its factorization.

21243013324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1157649 (or 1157647 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21243013324 its reverse (42331034212), we get a palindrome (63574047536).

The spelling of 21243013324 in words is "twenty-one billion, two hundred forty-three million, thirteen thousand, three hundred twenty-four".