21113433503 has 2 divisors, whose sum is σ = 21113433504. Its totient is φ = 21113433502.

The previous prime is 21113433443. The next prime is 21113433529. The reversal of 21113433503 is 30533431112.

It is an a-pointer prime, because the next prime (21113433529) can be obtained adding 21113433503 to its sum of digits (26).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21113433503 - 2²⁸ = 20844998047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113433703) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556716751 + 10556716752.

It is an arithmetic number, because the mean of its divisors is an integer number (10556716752).

Almost surely, 2^21113433503 is an apocalyptic number.

21113433503 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113433503 is an equidigital number, since it uses as much as digits as its factorization.

21113433503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21113433503 its reverse (30533431112), we get a palindrome (51646864615).

The spelling of 21113433503 in words is "twenty-one billion, one hundred thirteen million, four hundred thirty-three thousand, five hundred three".