21112011120 has 80 divisors (see below), whose sum is σ = 68891840640. Its totient is φ = 5333559552.

The previous prime is 21112011097. The next prime is 21112011133. The reversal of 21112011120 is 2111021112.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 21112011096 and 21112011105.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2310354 + ... + 2319473.

It is an arithmetic number, because the mean of its divisors is an integer number (861148008).

Almost surely, 2^21112011120 is an apocalyptic number.

21112011120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21112011120 is an abundant number, since it is smaller than the sum of its proper divisors (47779829520).

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

21112011120 is a wasteful number, since it uses less digits than its factorization.

21112011120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4629862 (or 4629856 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21112011120 its reverse (2111021112), we get a palindrome (23223032232).

The spelling of 21112011120 in words is "twenty-one billion, one hundred twelve million, eleven thousand, one hundred twenty".