21434021104 has 40 divisors (see below), whose sum is σ = 43046307360. Its totient is φ = 10326774528.

The previous prime is 21434021051. The next prime is 21434021111. The reversal of 21434021104 is 40112043412.

It is a happy number.

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, 187474 + ... + 279310.

It is an arithmetic number, because the mean of its divisors is an integer number (1076157684).

Almost surely, 2^21434021104 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 21434021104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21523153680).

21434021104 is an abundant number, since it is smaller than the sum of its proper divisors (21612286256).

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

21434021104 is a wasteful number, since it uses less digits than its factorization.

21434021104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92377 (or 92371 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

Adding to 21434021104 its reverse (40112043412), we get a palindrome (61546064516).

The spelling of 21434021104 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, one hundred four".