21104602434 has 96 divisors (see below), whose sum is σ = 50666788800. Its totient is φ = 6508546560.

The previous prime is 21104602433. The next prime is 21104602471. The reversal of 21104602434 is 43420640112.

It is a happy number.

21104602434 is a `hidden beast` number, since 2 + 1 + 10 + 4 + 602 + 43 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 21104602398 and 21104602407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21104602433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 909294 + ... + 932214.

It is an arithmetic number, because the mean of its divisors is an integer number (527779050).

Almost surely, 2^21104602434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21104602434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25333394400).

21104602434 is an abundant number, since it is smaller than the sum of its proper divisors (29562186366).

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

21104602434 is a wasteful number, since it uses less digits than its factorization.

21104602434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23025 (or 23002 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The spelling of 21104602434 in words is "twenty-one billion, one hundred four million, six hundred two thousand, four hundred thirty-four".