21044121344004 has 96 divisors (see below), whose sum is σ = 53859945000960. Its totient is φ = 6342170947200.

The previous prime is 21044121343873. The next prime is 21044121344011. The reversal of 21044121344004 is 40044312144012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29644494 + ... + 30346074.

It is an arithmetic number, because the mean of its divisors is an integer number (561041093760).

Almost surely, 2^{21044121344004} 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 21044121344004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26929972500480).

21044121344004 is an abundant number, since it is smaller than the sum of its proper divisors (32815823656956).

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

21044121344004 is a wasteful number, since it uses less digits than its factorization.

21044121344004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 702841 (or 702839 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 30.

Adding to 21044121344004 its reverse (40044312144012), we get a palindrome (61088433488016).

The spelling of 21044121344004 in words is "twenty-one trillion, forty-four billion, one hundred twenty-one million, three hundred forty-four thousand, four".