21113112 has 16 divisors (see below), whose sum is σ = 52782840. Its totient is φ = 7037696.

The previous prime is 21113111. The next prime is 21113119. The reversal of 21113112 is 21131112.

It is a Harshad number since it is a multiple of its sum of digits (12).

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 congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113111) 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, 439833 + ... + 439880.

Almost surely, 2^21113112 is an apocalyptic number.

It is an amenable number.

21113112 is an abundant number, since it is smaller than the sum of its proper divisors (31669728).

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

21113112 is a wasteful number, since it uses less digits than its factorization.

21113112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879722 (or 879718 counting only the distinct ones).

The product of its digits is 12, while the sum is 12.

The square root of 21113112 is about 4594.9006518096. The cubic root of 21113112 is about 276.3868760624.

Adding to 21113112 its reverse (21131112), we get a palindrome (42244224).

The spelling of 21113112 in words is "twenty-one million, one hundred thirteen thousand, one hundred twelve".