21116112 has 20 divisors (see below), whose sum is σ = 54550080. Its totient is φ = 7038688.

The previous prime is 21116099. The next prime is 21116119. The reversal of 21116112 is 21161112.

It is a happy number.

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 21116091 and 21116100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116119) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219912 + ... + 220007.

It is an arithmetic number, because the mean of its divisors is an integer number (2727504).

Almost surely, 2^21116112 is an apocalyptic number.

It is an amenable number.

21116112 is an abundant number, since it is smaller than the sum of its proper divisors (33433968).

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

21116112 is a wasteful number, since it uses less digits than its factorization.

21116112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439930 (or 439924 counting only the distinct ones).

The product of its digits is 24, while the sum is 15.

The square root of 21116112 is about 4595.2270890566. The cubic root of 21116112 is about 276.3999662116.

Adding to 21116112 its reverse (21161112), we get a palindrome (42277224).

The spelling of 21116112 in words is "twenty-one million, one hundred sixteen thousand, one hundred twelve".