21433144 has 8 divisors (see below), whose sum is σ = 40187160. Its totient is φ = 10716568.

The previous prime is 21433133. The next prime is 21433151. The reversal of 21433144 is 44133412.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent 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 as a sum of consecutive naturals, namely, 1339564 + ... + 1339579.

It is an arithmetic number, because the mean of its divisors is an integer number (5023395).

Almost surely, 2^21433144 is an apocalyptic number.

It is an amenable number.

21433144 is a deficient number, since it is larger than the sum of its proper divisors (18754016).

21433144 is a wasteful number, since it uses less digits than its factorization.

21433144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679149 (or 2679145 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 21433144 is about 4629.5943666805. The cubic root of 21433144 is about 277.7763672580.

Adding to 21433144 its reverse (44133412), we get a palindrome (65566556).

The spelling of 21433144 in words is "twenty-one million, four hundred thirty-three thousand, one hundred forty-four".