21331120120 has 64 divisors (see below), whose sum is σ = 49623516000. Its totient is φ = 8246039040.

The previous prime is 21331120117. The next prime is 21331120147. The reversal of 21331120120 is 2102113312.

It is a junction number, because it is equal to n+sod(n) for n = 21331120094 and 21331120103.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172155 + ... + 268885.

Almost surely, 2^21331120120 is an apocalyptic number.

21331120120 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 21331120120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24811758000).

21331120120 is an abundant number, since it is smaller than the sum of its proper divisors (28292395880).

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

21331120120 is a wasteful number, since it uses less digits than its factorization.

21331120120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96928 (or 96924 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21331120120 its reverse (2102113312), we get a palindrome (23433233432).

The spelling of 21331120120 in words is "twenty-one billion, three hundred thirty-one million, one hundred twenty thousand, one hundred twenty".