21234043344 has 80 divisors (see below), whose sum is σ = 55469664000. Its totient is φ = 6998949888.

The previous prime is 21234043283. The next prime is 21234043357. The reversal of 21234043344 is 44334043212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2431017 + ... + 2439735.

It is an arithmetic number, because the mean of its divisors is an integer number (693370800).

Almost surely, 2^21234043344 is an apocalyptic number.

21234043344 is a gapful number since it is divisible by the number (24) 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 21234043344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27734832000).

21234043344 is an abundant number, since it is smaller than the sum of its proper divisors (34235620656).

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

21234043344 is a wasteful number, since it uses less digits than its factorization.

21234043344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9292 (or 9286 counting only the distinct ones).

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

Adding to 21234043344 its reverse (44334043212), we get a palindrome (65568086556).

The spelling of 21234043344 in words is "twenty-one billion, two hundred thirty-four million, forty-three thousand, three hundred forty-four".