21433244 has 24 divisors (see below), whose sum is σ = 43182720. Its totient is φ = 9117936.

The previous prime is 21433231. The next prime is 21433259. The reversal of 21433244 is 44233412.

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, 1139 + ... + 6645.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^21433244 is an apocalyptic number.

It is an amenable number.

21433244 is an abundant number, since it is smaller than the sum of its proper divisors (21749476).

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

21433244 is a wasteful number, since it uses less digits than its factorization.

21433244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5657 (or 5655 counting only the distinct ones).

The product of its digits is 2304, while the sum is 23.

The square root of 21433244 is about 4629.6051667502. The cubic root of 21433244 is about 277.7767992617.

Adding to 21433244 its reverse (44233412), we get a palindrome (65666656).

The spelling of 21433244 in words is "twenty-one million, four hundred thirty-three thousand, two hundred forty-four".