21133310432 has 96 divisors (see below), whose sum is σ = 47522583360. Its totient is φ = 9176555520.

The previous prime is 21133310383. The next prime is 21133310459. The reversal of 21133310432 is 23401333112.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a junction number, because it is equal to n+sod(n) for n = 21133310398 and 21133310407.

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, 565544 + ... + 601752.

It is an arithmetic number, because the mean of its divisors is an integer number (495026910).

Almost surely, 2^21133310432 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 21133310432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23761291680).

21133310432 is an abundant number, since it is smaller than the sum of its proper divisors (26389272928).

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

21133310432 is a wasteful number, since it uses less digits than its factorization.

21133310432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36316 (or 36308 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21133310432 its reverse (23401333112), we get a palindrome (44534643544).

The spelling of 21133310432 in words is "twenty-one billion, one hundred thirty-three million, three hundred ten thousand, four hundred thirty-two".