21112111102120 has 128 divisors (see below), whose sum is σ = 50848192454400. Its totient is φ = 7861167230976.

The previous prime is 21112111102109. The next prime is 21112111102141. The reversal of 21112111102120 is 2120111121112.

It is a super-2 number, since 2×21112111102120² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21112111102094 and 21112111102103.

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 31 ways as a sum of consecutive naturals, for example, 41476597 + ... + 41982523.

It is an arithmetic number, because the mean of its divisors is an integer number (397251503550).

Almost surely, 2^{21112111102120} is an apocalyptic number.

21112111102120 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 21112111102120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25424096227200).

21112111102120 is an abundant number, since it is smaller than the sum of its proper divisors (29736081352280).

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

21112111102120 is a wasteful number, since it uses less digits than its factorization.

21112111102120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506627 (or 506623 counting only the distinct ones).

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

Adding to 21112111102120 its reverse (2120111121112), we get a palindrome (23232222223232).

The spelling of 21112111102120 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, one hundred two thousand, one hundred twenty".