21443041033 has 4 divisors (see below), whose sum is σ = 22571622160. Its totient is φ = 20314459908.

The previous prime is 21443041019. The next prime is 21443041049. The reversal of 21443041033 is 33014034412.

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 a de Polignac number, because none of the positive numbers 2^k-21443041033 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21443040989 and 21443041007.

It is not an unprimeable number, because it can be changed into a prime (21443047033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564290535 + ... + 564290572.

It is an arithmetic number, because the mean of its divisors is an integer number (5642905540).

Almost surely, 2^21443041033 is an apocalyptic number.

It is an amenable number.

21443041033 is a deficient number, since it is larger than the sum of its proper divisors (1128581127).

21443041033 is a wasteful number, since it uses less digits than its factorization.

21443041033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1128581126.

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

Adding to 21443041033 its reverse (33014034412), we get a palindrome (54457075445).

The spelling of 21443041033 in words is "twenty-one billion, four hundred forty-three million, forty-one thousand, thirty-three".