21433442413 has 4 divisors (see below), whose sum is σ = 21473061148. Its totient is φ = 21393823680.

The previous prime is 21433442341. The next prime is 21433442417. The reversal of 21433442413 is 31424433412.

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 12116945929 + 9316496484 = 110077^2 + 96522^2 .

It is a cyclic number.

It is not a de Polignac number, because 21433442413 - 2²¹ = 21431345261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21433442417) 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, 19808556 + ... + 19809637.

It is an arithmetic number, because the mean of its divisors is an integer number (5368265287).

Almost surely, 2^21433442413 is an apocalyptic number.

It is an amenable number.

21433442413 is a deficient number, since it is larger than the sum of its proper divisors (39618735).

21433442413 is an equidigital number, since it uses as much as digits as its factorization.

21433442413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39618734.

The product of its digits is 27648, while the sum is 31.

Adding to 21433442413 its reverse (31424433412), we get a palindrome (52857875825).

Subtracting 21433442413 from its reverse (31424433412), we obtain a palindrome (9990990999).

The spelling of 21433442413 in words is "twenty-one billion, four hundred thirty-three million, four hundred forty-two thousand, four hundred thirteen".