21238112 has 48 divisors (see below), whose sum is σ = 48625920. Its totient is φ = 8942208.

The previous prime is 21238103. The next prime is 21238127. The reversal of 21238112 is 21183212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12413 + ... + 14019.

It is an arithmetic number, because the mean of its divisors is an integer number (1013040).

Almost surely, 2^21238112 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 21238112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24312960).

21238112 is an abundant number, since it is smaller than the sum of its proper divisors (27387808).

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

21238112 is a wasteful number, since it uses less digits than its factorization.

21238112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683 (or 1675 counting only the distinct ones).

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

The square root of 21238112 is about 4608.4826136159. The cubic root of 21238112 is about 276.9312518638.

The spelling of 21238112 in words is "twenty-one million, two hundred thirty-eight thousand, one hundred twelve".