21432304304 has 60 divisors (see below), whose sum is σ = 45337232160. Its totient is φ = 9801993600.

The previous prime is 21432304261. The next prime is 21432304307. The reversal of 21432304304 is 40340323412.

It is not an unprimeable number, because it can be changed into a prime (21432304307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 103529 + ... + 231479.

It is an arithmetic number, because the mean of its divisors is an integer number (755620536).

Almost surely, 2^21432304304 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 21432304304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22668616080).

21432304304 is an abundant number, since it is smaller than the sum of its proper divisors (23904927856).

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

21432304304 is a wasteful number, since it uses less digits than its factorization.

21432304304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128026 (or 128001 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21432304304 its reverse (40340323412), we get a palindrome (61772627716).

The spelling of 21432304304 in words is "twenty-one billion, four hundred thirty-two million, three hundred four thousand, three hundred four".