21344043433 has 4 divisors (see below), whose sum is σ = 22467414160. Its totient is φ = 20220672708.

The previous prime is 21344043389. The next prime is 21344043437. The reversal of 21344043433 is 33434044312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21344043433 - 2⁹ = 21344042921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21344043395 and 21344043404.

It is not an unprimeable number, because it can be changed into a prime (21344043437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 561685335 + ... + 561685372.

It is an arithmetic number, because the mean of its divisors is an integer number (5616853540).

Almost surely, 2^21344043433 is an apocalyptic number.

It is an amenable number.

21344043433 is a deficient number, since it is larger than the sum of its proper divisors (1123370727).

21344043433 is a wasteful number, since it uses less digits than its factorization.

21344043433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123370726.

The product of its (nonzero) digits is 41472, while the sum is 31.

Adding to 21344043433 its reverse (33434044312), we get a palindrome (54778087745).

The spelling of 21344043433 in words is "twenty-one billion, three hundred forty-four million, forty-three thousand, four hundred thirty-three".