21598272 has 112 divisors (see below), whose sum is σ = 65836800. Its totient is φ = 6935040.

The previous prime is 21598259. The next prime is 21598273. The reversal of 21598272 is 27289512.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21598273) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 49897 + ... + 50327.

Almost surely, 2^21598272 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 21598272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32918400).

21598272 is an abundant number, since it is smaller than the sum of its proper divisors (44238528).

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

21598272 is a wasteful number, since it uses less digits than its factorization.

21598272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481 (or 465 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 21598272 is about 4647.3941085301. The cubic root of 21598272 is about 278.4879032766.

The spelling of 21598272 in words is "twenty-one million, five hundred ninety-eight thousand, two hundred seventy-two".