21404434230 has 96 divisors (see below), whose sum is σ = 58844298240. Its totient is φ = 5383091520.

The previous prime is 21404434213. The next prime is 21404434237. The reversal of 21404434230 is 3243440412.

It is a happy number.

21404434230 is a `hidden beast` number, since 21 + 404 + 4 + 3 + 4 + 230 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21404434194 and 21404434203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21404434237) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 353265 + ... + 409395.

It is an arithmetic number, because the mean of its divisors is an integer number (612961440).

Almost surely, 2^21404434230 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21404434230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29422149120).

21404434230 is an abundant number, since it is smaller than the sum of its proper divisors (37439864010).

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

21404434230 is a wasteful number, since it uses less digits than its factorization.

21404434230 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56386 (or 56383 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21404434230 its reverse (3243440412), we get a palindrome (24647874642).

The spelling of 21404434230 in words is "twenty-one billion, four hundred four million, four hundred thirty-four thousand, two hundred thirty".