21204424110 has 64 divisors (see below), whose sum is σ = 51774971904. Its totient is φ = 5556432000.

The previous prime is 21204424103. The next prime is 21204424127. The reversal of 21204424110 is 1142440212.

It is a congruent 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, 2101297 + ... + 2111363.

It is an arithmetic number, because the mean of its divisors is an integer number (808983936).

Almost surely, 2^21204424110 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21204424110, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25887485952).

21204424110 is an abundant number, since it is smaller than the sum of its proper divisors (30570547794).

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

21204424110 is a wasteful number, since it uses less digits than its factorization.

21204424110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11289.

The product of its (nonzero) digits is 512, while the sum is 21.

Adding to 21204424110 its reverse (1142440212), we get a palindrome (22346864322).

The spelling of 21204424110 in words is "twenty-one billion, two hundred four million, four hundred twenty-four thousand, one hundred ten".