21112020112 has 40 divisors (see below), whose sum is σ = 43320783096. Its totient is φ = 9932752896.

The previous prime is 21112020077. The next prime is 21112020113. The reversal of 21112020112 is 21102021112.

It can be written as a sum of positive squares in 4 ways, for example, as 7334894736 + 13777125376 = 85644^2 + 117376^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21112020092 and 21112020101.

It is not an unprimeable number, because it can be changed into a prime (21112020113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1897638 + ... + 1908730.

Almost surely, 2^21112020112 is an apocalyptic number.

It is an amenable number.

21112020112 is an abundant number, since it is smaller than the sum of its proper divisors (22208762984).

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

21112020112 is a wasteful number, since it uses less digits than its factorization.

21112020112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18115 (or 18109 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21112020112 its reverse (21102021112), we get a palindrome (42214041224).

The spelling of 21112020112 in words is "twenty-one billion, one hundred twelve million, twenty thousand, one hundred twelve".