21112020111112 has 48 divisors (see below), whose sum is σ = 46069695480060. Its totient is φ = 9043726196736.

The previous prime is 21112020111097. The next prime is 21112020111113. The reversal of 21112020111112 is 21111102021112.

It can be written as a sum of positive squares in 2 ways, for example, as 18034851588516 + 3077168522596 = 4246746^2 + 1754186^2 .

It is not an unprimeable number, because it can be changed into a prime (21112020111113) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11915953 + ... + 13572544.

Almost surely, 2^{21112020111112} is an apocalyptic number.

It is an amenable number.

21112020111112 is an abundant number, since it is smaller than the sum of its proper divisors (24957675368948).

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

21112020111112 is a wasteful number, since it uses less digits than its factorization.

21112020111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25490630 (or 25490619 counting only the distinct ones).

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

Adding to 21112020111112 its reverse (21111102021112), we get a palindrome (42223122132224).

Subtracting from 21112020111112 its reverse (21111102021112), we obtain a square (918090000 = 30300²).

The spelling of 21112020111112 in words is "twenty-one trillion, one hundred twelve billion, twenty million, one hundred eleven thousand, one hundred twelve".