21432000 has 224 divisors, whose sum is σ = 76078080. Its totient is φ = 5299200.

The previous prime is 21431983. The next prime is 21432013. The reversal of 21432000 is 23412.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 455977 + ... + 456023.

Almost surely, 2^21432000 is an apocalyptic number.

21432000 is a gapful number since it is divisible by the number (20) 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 21432000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38039040).

21432000 is an abundant number, since it is smaller than the sum of its proper divisors (54646080).

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

21432000 is a wasteful number, since it uses less digits than its factorization.

21432000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96 (or 76 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21432000 is about 4629.4708120907. The cubic root of 21432000 is about 277.7714250399.

Adding to 21432000 its reverse (23412), we get a palindrome (21455412).

The spelling of 21432000 in words is "twenty-one million, four hundred thirty-two thousand".