21404330112 has 128 divisors (see below), whose sum is σ = 63537203520. Its totient is φ = 6327910400.

The previous prime is 21404330111. The next prime is 21404330257. The reversal of 21404330112 is 21103340412.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (21404330111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111388 + ... + 234980.

Almost surely, 2^21404330112 is an apocalyptic number.

21404330112 is a gapful number since it is divisible by the number (22) 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 21404330112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31768601760).

21404330112 is an abundant number, since it is smaller than the sum of its proper divisors (42132873408).

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

21404330112 is a wasteful number, since it uses less digits than its factorization.

21404330112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123662 (or 123650 counting only the distinct ones).

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

Adding to 21404330112 its reverse (21103340412), we get a palindrome (42507670524).

The spelling of 21404330112 in words is "twenty-one billion, four hundred four million, three hundred thirty thousand, one hundred twelve".