21200432 has 40 divisors (see below), whose sum is σ = 45145920. Its totient is φ = 9564480.

The previous prime is 21200401. The next prime is 21200461. The reversal of 21200432 is 23400212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28319 + ... + 29057.

It is an arithmetic number, because the mean of its divisors is an integer number (1128648).

Almost surely, 2^21200432 is an apocalyptic number.

21200432 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21200432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22572960).

21200432 is an abundant number, since it is smaller than the sum of its proper divisors (23945488).

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

21200432 is a wasteful number, since it uses less digits than its factorization.

21200432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921 (or 915 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 14.

The square root of 21200432 is about 4604.3926852518. The cubic root of 21200432 is about 276.7673806327.

Adding to 21200432 its reverse (23400212), we get a palindrome (44600644).

The spelling of 21200432 in words is "twenty-one million, two hundred thousand, four hundred thirty-two".