21433430443 has 4 divisors (see below), whose sum is σ = 21434323680. Its totient is φ = 21432537208.

The previous prime is 21433430437. The next prime is 21433430471. The reversal of 21433430443 is 34403433412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21433430443 - 2⁹ = 21433429931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433431443) 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, 409603 + ... + 458956.

It is an arithmetic number, because the mean of its divisors is an integer number (5358580920).

Almost surely, 2^21433430443 is an apocalyptic number.

21433430443 is a deficient number, since it is larger than the sum of its proper divisors (893237).

21433430443 is an equidigital number, since it uses as much as digits as its factorization.

21433430443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893236.

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

Adding to 21433430443 its reverse (34403433412), we get a palindrome (55836863855).

The spelling of 21433430443 in words is "twenty-one billion, four hundred thirty-three million, four hundred thirty thousand, four hundred forty-three".