21433044013 has 4 divisors (see below), whose sum is σ = 21596655168. Its totient is φ = 21269432860.

The previous prime is 21433044001. The next prime is 21433044019. The reversal of 21433044013 is 31044033412.

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 a cyclic number.

It is not a de Polignac number, because 21433044013 - 2²⁵ = 21399489581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433044019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81805381 + ... + 81805642.

It is an arithmetic number, because the mean of its divisors is an integer number (5399163792).

Almost surely, 2^21433044013 is an apocalyptic number.

It is an amenable number.

21433044013 is a deficient number, since it is larger than the sum of its proper divisors (163611155).

21433044013 is a wasteful number, since it uses less digits than its factorization.

21433044013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163611154.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21433044013 its reverse (31044033412), we get a palindrome (52477077425).

The spelling of 21433044013 in words is "twenty-one billion, four hundred thirty-three million, forty-four thousand, thirteen".