21433008 has 40 divisors (see below), whose sum is σ = 55929456. Its totient is φ = 7072000.

The previous prime is 21432991. The next prime is 21433051. The reversal of 21433008 is 80033412.

It is a happy 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, 2638 + ... + 7058.

Almost surely, 2^21433008 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 21433008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27964728).

21433008 is an abundant number, since it is smaller than the sum of its proper divisors (34496448).

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

21433008 is a wasteful number, since it uses less digits than its factorization.

21433008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4533 (or 4527 counting only the distinct ones).

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

The square root of 21433008 is about 4629.5796785453. The cubic root of 21433008 is about 277.7757797308.

It can be divided in two parts, 2143 and 3008, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 21433008 in words is "twenty-one million, four hundred thirty-three thousand, eight".