21433443433 has 4 divisors (see below), whose sum is σ = 21956210388. Its totient is φ = 20910676480.

The previous prime is 21433443419. The next prime is 21433443443. The reversal of 21433443433 is 33434433412.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2425858009 + 19007585424 = 49253^2 + 137868^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433443433 - 2³³ = 12843508841 is a prime.

It is a super-2 number, since 2×21433443433² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21433443403) 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, 261383416 + ... + 261383497.

It is an arithmetic number, because the mean of its divisors is an integer number (5489052597).

Almost surely, 2^21433443433 is an apocalyptic number.

It is an amenable number.

21433443433 is a deficient number, since it is larger than the sum of its proper divisors (522766955).

21433443433 is an equidigital number, since it uses as much as digits as its factorization.

21433443433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 522766954.

The product of its digits is 124416, while the sum is 34.

Adding to 21433443433 its reverse (33434433412), we get a palindrome (54867876845).

The spelling of 21433443433 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty-three thousand, four hundred thirty-three".