21112111211112 has 64 divisors (see below), whose sum is σ = 61194525264000. Its totient is φ = 6731397775872.

The previous prime is 21112111211111. The next prime is 21112111211207. The reversal of 21112111211112 is 21111211121112.

21112111211112 is a `hidden beast` number, since 211 + 121 + 11 + 211 + 112 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (21112111211111) 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, 2124804937 + ... + 2124814872.

It is an arithmetic number, because the mean of its divisors is an integer number (956164457250).

Almost surely, 2^{21112111211112} is an apocalyptic number.

It is an amenable number.

21112111211112 is an abundant number, since it is smaller than the sum of its proper divisors (40082414052888).

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

21112111211112 is a wasteful number, since it uses less digits than its factorization.

21112111211112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4249619847 (or 4249619837 counting only the distinct ones).

The product of its digits is 16, while the sum is 18.

Adding to 21112111211112 its reverse (21111211121112), we get a palindrome (42223322332224).

The spelling of 21112111211112 in words is "twenty-one trillion, one hundred twelve billion, one hundred eleven million, two hundred eleven thousand, one hundred twelve".