21124431324 has 18 divisors (see below), whose sum is σ = 53397868160. Its totient is φ = 7041477096.

The previous prime is 21124431311. The next prime is 21124431359. The reversal of 21124431324 is 42313442112.

21124431324 is a `hidden beast` number, since 211 + 2 + 443 + 1 + 3 + 2 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293394844 + ... + 293394915.

Almost surely, 2^21124431324 is an apocalyptic number.

It is an amenable number.

21124431324 is an abundant number, since it is smaller than the sum of its proper divisors (32273436836).

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

21124431324 is a wasteful number, since it uses less digits than its factorization.

21124431324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 586789769 (or 586789764 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

Adding to 21124431324 its reverse (42313442112), we get a palindrome (63437873436).

The spelling of 21124431324 in words is "twenty-one billion, one hundred twenty-four million, four hundred thirty-one thousand, three hundred twenty-four".