21113424443320 has 128 divisors (see below), whose sum is σ = 52975758931200. Its totient is φ = 7508606054400.

The previous prime is 21113424443317. The next prime is 21113424443429. The reversal of 21113424443320 is 2334442431112.

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, 1521480 + ... + 6673960.

It is an arithmetic number, because the mean of its divisors is an integer number (413873116650).

Almost surely, 2^{21113424443320} is an apocalyptic number.

21113424443320 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 21113424443320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26487879465600).

21113424443320 is an abundant number, since it is smaller than the sum of its proper divisors (31862334487880).

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

21113424443320 is a wasteful number, since it uses less digits than its factorization.

21113424443320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5152709 (or 5152705 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

Adding to 21113424443320 its reverse (2334442431112), we get a palindrome (23447866874432).

The spelling of 21113424443320 in words is "twenty-one trillion, one hundred thirteen billion, four hundred twenty-four million, four hundred forty-three thousand, three hundred twenty".