21433608 has 144 divisors (see below), whose sum is σ = 70873920. Its totient is φ = 5721408.

The previous prime is 21433597. The next prime is 21433609. The reversal of 21433608 is 80633412.

It is a happy number.

21433608 is a `hidden beast` number, since 21 + 4 + 33 + 608 = 666.

It is not an unprimeable number, because it can be changed into a prime (21433609) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 498435 + ... + 498477.

It is an arithmetic number, because the mean of its divisors is an integer number (492180).

Almost surely, 2^21433608 is an apocalyptic number.

21433608 is a gapful number since it is divisible by the number (28) 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 21433608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35436960).

21433608 is an abundant number, since it is smaller than the sum of its proper divisors (49440312).

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

21433608 is a wasteful number, since it uses less digits than its factorization.

21433608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 21433608 is about 4629.6444787910. The cubic root of 21433608 is about 277.7783717439.

The spelling of 21433608 in words is "twenty-one million, four hundred thirty-three thousand, six hundred eight".