21328112 has 20 divisors (see below), whose sum is σ = 44502360. Its totient is φ = 9843648.

The previous prime is 21328103. The next prime is 21328117. The reversal of 21328112 is 21182312.

It is a super-2 number, since 2×21328112² = 909776722969088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21328117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51062 + ... + 51477.

It is an arithmetic number, because the mean of its divisors is an integer number (2225118).

Almost surely, 2^21328112 is an apocalyptic number.

It is an amenable number.

21328112 is an abundant number, since it is smaller than the sum of its proper divisors (23174248).

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

21328112 is a wasteful number, since it uses less digits than its factorization.

21328112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102560 (or 102554 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 21328112 is about 4618.2368930145. The cubic root of 21328112 is about 277.3218812045.

The spelling of 21328112 in words is "twenty-one million, three hundred twenty-eight thousand, one hundred twelve".