21344043432 has 32 divisors (see below), whose sum is σ = 54264520800. Its totient is φ = 6994092864.

The previous prime is 21344043389. The next prime is 21344043437. The reversal of 21344043432 is 23434044312.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 21344043432.

It is not an unprimeable number, because it can be changed into a prime (21344043437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7535323 + ... + 7538154.

It is an arithmetic number, because the mean of its divisors is an integer number (1695766275).

Almost surely, 2^21344043432 is an apocalyptic number.

It is an amenable number.

21344043432 is an abundant number, since it is smaller than the sum of its proper divisors (32920477368).

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

21344043432 is a wasteful number, since it uses less digits than its factorization.

21344043432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15073545 (or 15073541 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 30.

Adding to 21344043432 its reverse (23434044312), we get a palindrome (44778087744).

The spelling of 21344043432 in words is "twenty-one billion, three hundred forty-four million, forty-three thousand, four hundred thirty-two".