21112112 has 40 divisors (see below), whose sum is σ = 46996992. Its totient is φ = 9000000.

The previous prime is 21112103. The next prime is 21112121. The reversal of 21112112 is 21121112.

It is an interprime number because it is at equal distance from previous prime (21112103) and next prime (21112121).

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 = 21112093 and 21112102.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27737 + ... + 28487.

Almost surely, 2^21112112 is an apocalyptic number.

It is an amenable number.

21112112 is an abundant number, since it is smaller than the sum of its proper divisors (25884880).

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

21112112 is a wasteful number, since it uses less digits than its factorization.

21112112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017 (or 1011 counting only the distinct ones).

The product of its digits is 8, while the sum is 11.

The square root of 21112112 is about 4594.7918342402. The cubic root of 21112112 is about 276.3825124037.

Adding to 21112112 its reverse (21121112), we get a palindrome (42233224).

The spelling of 21112112 in words is "twenty-one million, one hundred twelve thousand, one hundred twelve".