21331112 has 16 divisors (see below), whose sum is σ = 43632000. Its totient is φ = 9695920.

The previous prime is 21331109. The next prime is 21331127. The reversal of 21331112 is 21113312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121112 + ... + 121287.

It is an arithmetic number, because the mean of its divisors is an integer number (2727000).

Almost surely, 2^21331112 is an apocalyptic number.

21331112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21331112 is an abundant number, since it is smaller than the sum of its proper divisors (22300888).

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

21331112 is a wasteful number, since it uses less digits than its factorization.

21331112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242416 (or 242412 counting only the distinct ones).

The product of its digits is 36, while the sum is 14.

The square root of 21331112 is about 4618.5616808699. The cubic root of 21331112 is about 277.3348832404.

Adding to 21331112 its reverse (21113312), we get a palindrome (42444424).

It can be divided in two parts, 21 and 331112, that added together give a palindrome (331133).

The spelling of 21331112 in words is "twenty-one million, three hundred thirty-one thousand, one hundred twelve".