21320110344 has 128 divisors (see below), whose sum is σ = 58134384000. Its totient is φ = 6476488704.

The previous prime is 21320110333. The next prime is 21320110391. The reversal of 21320110344 is 44301102312.

It is a self number, because there is not a number n which added to its sum of digits gives 21320110344.

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, 19943442 + ... + 19944510.

It is an arithmetic number, because the mean of its divisors is an integer number (454174875).

Almost surely, 2^21320110344 is an apocalyptic number.

21320110344 is a gapful number since it is divisible by the number (24) 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 21320110344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29067192000).

21320110344 is an abundant number, since it is smaller than the sum of its proper divisors (36814273656).

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

21320110344 is a wasteful number, since it uses less digits than its factorization.

21320110344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847 (or 1843 counting only the distinct ones).

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

Adding to 21320110344 its reverse (44301102312), we get a palindrome (65621212656).

The spelling of 21320110344 in words is "twenty-one billion, three hundred twenty million, one hundred ten thousand, three hundred forty-four".