21032443432 has 128 divisors (see below), whose sum is σ = 53265542400. Its totient is φ = 7563628800.

The previous prime is 21032443423. The next prime is 21032443441. The reversal of 21032443432 is 23434423012.

It is an interprime number because it is at equal distance from previous prime (21032443423) and next prime (21032443441).

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 21032443432.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1345582 + ... + 1361122.

It is an arithmetic number, because the mean of its divisors is an integer number (416137050).

Almost surely, 2^21032443432 is an apocalyptic number.

21032443432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21032443432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26632771200).

21032443432 is an abundant number, since it is smaller than the sum of its proper divisors (32233098968).

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

21032443432 is a wasteful number, since it uses less digits than its factorization.

21032443432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604 (or 15574 counting only the distinct ones).

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

Adding to 21032443432 its reverse (23434423012), we get a palindrome (44466866444).

It can be divided in two parts, 21032 and 443432, that added together give a palindrome (464464).

The spelling of 21032443432 in words is "twenty-one billion, thirty-two million, four hundred forty-three thousand, four hundred thirty-two".