21200032 has 96 divisors (see below), whose sum is σ = 51093504. Its totient is φ = 8467200.

The previous prime is 21200021. The next prime is 21200041. The reversal of 21200032 is 23000212.

It is a junction number, because it is equal to n+sod(n) for n = 21199991 and 21200018.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 298557 + ... + 298627.

It is an arithmetic number, because the mean of its divisors is an integer number (532224).

Almost surely, 2^21200032 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 21200032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25546752).

21200032 is an abundant number, since it is smaller than the sum of its proper divisors (29893472).

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

21200032 is a wasteful number, since it uses less digits than its factorization.

21200032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 154 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 21200032 is about 4604.3492482652. The cubic root of 21200032 is about 276.7656399819.

Adding to 21200032 its reverse (23000212), we get a palindrome (44200244).

The spelling of 21200032 in words is "twenty-one million, two hundred thousand, thirty-two".