21334402432 has 192 divisors, whose sum is σ = 50880407040. Its totient is φ = 8906365440.

The previous prime is 21334402379. The next prime is 21334402489. The reversal of 21334402432 is 23420443312.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 21334402432.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 101110807 + ... + 101111017.

It is an arithmetic number, because the mean of its divisors is an integer number (265002120).

Almost surely, 2^21334402432 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 21334402432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25440203520).

21334402432 is an abundant number, since it is smaller than the sum of its proper divisors (29546004608).

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

21334402432 is an frugal number, since it uses more digits than its factorization.

21334402432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 267 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21334402432 its reverse (23420443312), we get a palindrome (44754845744).

The spelling of 21334402432 in words is "twenty-one billion, three hundred thirty-four million, four hundred two thousand, four hundred thirty-two".