21432112 has 40 divisors (see below), whose sum is σ = 45059616. Its totient is φ = 9816576.

The previous prime is 21432107. The next prime is 21432157. The reversal of 21432112 is 21123412.

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 34428 + ... + 35044.

Almost surely, 2^21432112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21432112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22529808).

21432112 is an abundant number, since it is smaller than the sum of its proper divisors (23627504).

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

21432112 is a wasteful number, since it uses less digits than its factorization.

21432112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805 (or 799 counting only the distinct ones).

The product of its digits is 96, while the sum is 16.

The square root of 21432112 is about 4629.4829084899. The cubic root of 21432112 is about 277.7719089012.

Adding to 21432112 its reverse (21123412), we get a palindrome (42555524).

The spelling of 21432112 in words is "twenty-one million, four hundred thirty-two thousand, one hundred twelve".