21042433103 has 4 divisors (see below), whose sum is σ = 21052755120. Its totient is φ = 21032111088.

The previous prime is 21042433099. The next prime is 21042433169. The reversal of 21042433103 is 30133424012.

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 21042433103 - 2² = 21042433099 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 (21042433183) 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, 5157950 + ... + 5162027.

It is an arithmetic number, because the mean of its divisors is an integer number (5263188780).

Almost surely, 2^21042433103 is an apocalyptic number.

21042433103 is a deficient number, since it is larger than the sum of its proper divisors (10322017).

21042433103 is a wasteful number, since it uses less digits than its factorization.

21042433103 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10322016.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21042433103 its reverse (30133424012), we get a palindrome (51175857115).

Subtracting 21042433103 from its reverse (30133424012), we obtain a palindrome (9090990909).

The spelling of 21042433103 in words is "twenty-one billion, forty-two million, four hundred thirty-three thousand, one hundred three".