21113203330432 has 128 divisors (see below), whose sum is σ = 43063236057600. Its totient is φ = 10308340224000.

The previous prime is 21113203330421. The next prime is 21113203330459. The reversal of 21113203330432 is 23403330231112.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21113203330432.

It is a congruent number.

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, 620248069 + ... + 620282107.

It is an arithmetic number, because the mean of its divisors is an integer number (336431531700).

Almost surely, 2^{21113203330432} 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 21113203330432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21531618028800).

21113203330432 is an abundant number, since it is smaller than the sum of its proper divisors (21950032727168).

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

21113203330432 is a wasteful number, since it uses less digits than its factorization.

21113203330432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34776 (or 34764 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21113203330432 its reverse (23403330231112), we get a palindrome (44516533561544).

The spelling of 21113203330432 in words is "twenty-one trillion, one hundred thirteen billion, two hundred three million, three hundred thirty thousand, four hundred thirty-two".