21594112 has 32 divisors (see below), whose sum is σ = 43253100. Its totient is φ = 10780672.

The previous prime is 21594107. The next prime is 21594113. The reversal of 21594112 is 21149512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21594113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32439 + ... + 33097.

Almost surely, 2^21594112 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 21594112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21626550).

21594112 is an abundant number, since it is smaller than the sum of its proper divisors (21658988).

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

21594112 is an frugal number, since it uses more digits than its factorization.

21594112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689 (or 661 counting only the distinct ones).

The product of its digits is 720, while the sum is 25.

The square root of 21594112 is about 4646.9465243319. The cubic root of 21594112 is about 278.4700224624.

The spelling of 21594112 in words is "twenty-one million, five hundred ninety-four thousand, one hundred twelve".