21632112 has 30 divisors (see below), whose sum is σ = 60540272. Its totient is φ = 7210656.

The previous prime is 21632101. The next prime is 21632113. The reversal of 21632112 is 21123612.

21632112 is a `hidden beast` number, since 21 + 632 + 1 + 12 = 666.

It is a super-3 number, since 3×21632112³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (18).

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 (21632113) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74968 + ... + 75255.

Almost surely, 2^21632112 is an apocalyptic number.

It is an amenable number.

21632112 is an abundant number, since it is smaller than the sum of its proper divisors (38908160).

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

21632112 is a wasteful number, since it uses less digits than its factorization.

21632112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150237 (or 150228 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 21632112 is about 4651.0334335500. The cubic root of 21632112 is about 278.6332715896.

Adding to 21632112 its reverse (21123612), we get a palindrome (42755724).

The spelling of 21632112 in words is "twenty-one million, six hundred thirty-two thousand, one hundred twelve".