21204341344 has 48 divisors (see below), whose sum is σ = 42544051200. Its totient is φ = 10400270464.

The previous prime is 21204341311. The next prime is 21204341387. The reversal of 21204341344 is 44314340212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 892629 + ... + 916075.

It is an arithmetic number, because the mean of its divisors is an integer number (886334400).

Almost surely, 2^21204341344 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 21204341344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21272025600).

21204341344 is an abundant number, since it is smaller than the sum of its proper divisors (21339709856).

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

21204341344 is a wasteful number, since it uses less digits than its factorization.

21204341344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23995 (or 23987 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

Adding to 21204341344 its reverse (44314340212), we get a palindrome (65518681556).

The spelling of 21204341344 in words is "twenty-one billion, two hundred four million, three hundred forty-one thousand, three hundred forty-four".