21443055433 has 2 divisors, whose sum is σ = 21443055434. Its totient is φ = 21443055432.

The previous prime is 21443055427. The next prime is 21443055437. The reversal of 21443055433 is 33455034412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14841817929 + 6601237504 = 121827^2 + 81248^2 .

It is a cyclic number.

It is not a de Polignac number, because 21443055433 - 2²⁹ = 20906184521 is a prime.

It is not a weakly prime, because it can be changed into another prime (21443055437) 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 as a sum of consecutive naturals, namely, 10721527716 + 10721527717.

It is an arithmetic number, because the mean of its divisors is an integer number (10721527717).

Almost surely, 2^21443055433 is an apocalyptic number.

It is an amenable number.

21443055433 is a deficient number, since it is larger than the sum of its proper divisors (1).

21443055433 is an equidigital number, since it uses as much as digits as its factorization.

21443055433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 86400, while the sum is 34.

Adding to 21443055433 its reverse (33455034412), we get a palindrome (54898089845).

The spelling of 21443055433 in words is "twenty-one billion, four hundred forty-three million, fifty-five thousand, four hundred thirty-three".