21418112 has 16 divisors (see below), whose sum is σ = 42669150. Its totient is φ = 10708992.

The previous prime is 21418099. The next prime is 21418139. The reversal of 21418112 is 21181412.

It can be written as a sum of positive squares in only one way, i.e., 20286016 + 1132096 = 4504^2 + 1064^2 .

It is a tau number, because it is divible by the number of its divisors (16).

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 an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83537 + ... + 83792.

Almost surely, 2^21418112 is an apocalyptic number.

It is an amenable number.

21418112 is a deficient number, since it is larger than the sum of its proper divisors (21251038).

21418112 is an equidigital number, since it uses as much as digits as its factorization.

21418112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167343 (or 167331 counting only the distinct ones).

The product of its digits is 128, while the sum is 20.

The square root of 21418112 is about 4627.9706135627. The cubic root of 21418112 is about 277.7114131711.

Adding to 21418112 its reverse (21181412), we get a palindrome (42599524).

The spelling of 21418112 in words is "twenty-one million, four hundred eighteen thousand, one hundred twelve".