21433800 has 96 divisors (see below), whose sum is σ = 67183200. Its totient is φ = 5652480.

The previous prime is 21433771. The next prime is 21433831. The reversal of 21433800 is 833412.

It is a happy 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 23 ways as a sum of consecutive naturals, for example, 83272 + ... + 83528.

It is an arithmetic number, because the mean of its divisors is an integer number (699825).

Almost surely, 2^21433800 is an apocalyptic number.

21433800 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 21433800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33591600).

21433800 is an abundant number, since it is smaller than the sum of its proper divisors (45749400).

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

21433800 is a wasteful number, since it uses less digits than its factorization.

21433800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21433800 is about 4629.6652146781. The cubic root of 21433800 is about 277.7792011779.

The spelling of 21433800 in words is "twenty-one million, four hundred thirty-three thousand, eight hundred".