21124002432 has 128 divisors (see below), whose sum is σ = 60494535360. Its totient is φ = 6492413952.

The previous prime is 21124002407. The next prime is 21124002451. The reversal of 21124002432 is 23420042112.

It is a tau number, because it is divible by the number of its divisors (128).

It is a junction number, because it is equal to n+sod(n) for n = 21124002399 and 21124002408.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5953683 + ... + 5957229.

Almost surely, 2^21124002432 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 21124002432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30247267680).

21124002432 is an abundant number, since it is smaller than the sum of its proper divisors (39370532928).

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

21124002432 is a wasteful number, since it uses less digits than its factorization.

21124002432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4770 (or 4758 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21124002432 its reverse (23420042112), we get a palindrome (44544044544).

The spelling of 21124002432 in words is "twenty-one billion, one hundred twenty-four million, two thousand, four hundred thirty-two".