21111022120112 has 20 divisors (see below), whose sum is σ = 42222044241216. Its totient is φ = 10215010703040.

The previous prime is 21111022120061. The next prime is 21111022120117. The reversal of 21111022120112 is 21102122011112.

21111022120112 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21111022120117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21281271803 + ... + 21281272794.

Almost surely, 2^{21111022120112} is an apocalyptic number.

It is an amenable number.

21111022120112 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21111022120112 is a wasteful number, since it uses less digits than its factorization.

21111022120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42562544636 (or 42562544630 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21111022120112 its reverse (21102122011112), we get a palindrome (42213144131224).

The spelling of 21111022120112 in words is "twenty-one trillion, one hundred eleven billion, twenty-two million, one hundred twenty thousand, one hundred twelve".