21444043033 has 4 divisors (see below), whose sum is σ = 24507477760. Its totient is φ = 18380608308.

The previous prime is 21444042989. The next prime is 21444043067. The reversal of 21444043033 is 33034044412.

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 21444043033 - 2³³ = 12854108441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21444042992 and 21444043010.

It is not an unprimeable number, because it can be changed into a prime (21444043133) 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, 1531717353 + ... + 1531717366.

It is an arithmetic number, because the mean of its divisors is an integer number (6126869440).

Almost surely, 2^21444043033 is an apocalyptic number.

It is an amenable number.

21444043033 is a deficient number, since it is larger than the sum of its proper divisors (3063434727).

21444043033 is an equidigital number, since it uses as much as digits as its factorization.

21444043033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3063434726.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 21444043033 its reverse (33034044412), we get a palindrome (54478087445).

The spelling of 21444043033 in words is "twenty-one billion, four hundred forty-four million, forty-three thousand, thirty-three".