21433443 has 8 divisors (see below), whose sum is σ = 28601088. Its totient is φ = 14277384.

The previous prime is 21433441. The next prime is 21433453. The reversal of 21433443 is 34433412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21433443 - 2¹ = 21433441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21433441) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 3346 + ... + 7352.

It is an arithmetic number, because the mean of its divisors is an integer number (3575136).

Almost surely, 2^21433443 is an apocalyptic number.

21433443 is a deficient number, since it is larger than the sum of its proper divisors (7167645).

21433443 is a wasteful number, since it uses less digits than its factorization.

21433443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5793.

The product of its digits is 3456, while the sum is 24.

The square root of 21433443 is about 4629.6266588139. The cubic root of 21433443 is about 277.7776589451. Note that the first 3 decimals are identical.

Adding to 21433443 its reverse (34433412), we get a palindrome (55866855).

The spelling of 21433443 in words is "twenty-one million, four hundred thirty-three thousand, four hundred forty-three".