21044103600 has 240 divisors, whose sum is σ = 76418720000. Its totient is φ = 4907381760.

The previous prime is 21044103583. The next prime is 21044103653. The reversal of 21044103600 is 630144012.

It is a tau number, because it is divible by the number of its divisors (240).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 260901 + ... + 331899.

Almost surely, 2^21044103600 is an apocalyptic number.

21044103600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21044103600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38209360000).

21044103600 is an abundant number, since it is smaller than the sum of its proper divisors (55374616400).

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

21044103600 is a wasteful number, since it uses less digits than its factorization.

21044103600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71052 (or 71041 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21044103600 its reverse (630144012), we get a palindrome (21674247612).

The spelling of 21044103600 in words is "twenty-one billion, forty-four million, one hundred three thousand, six hundred".