21113424403 has 2 divisors, whose sum is σ = 21113424404. Its totient is φ = 21113424402.

The previous prime is 21113424401. The next prime is 21113424427. The reversal of 21113424403 is 30442431112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113424403 - 2¹ = 21113424401 is a prime.

Together with 21113424401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21113424401) 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 as a sum of consecutive naturals, namely, 10556712201 + 10556712202.

It is an arithmetic number, because the mean of its divisors is an integer number (10556712202).

Almost surely, 2^21113424403 is an apocalyptic number.

21113424403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113424403 is an equidigital number, since it uses as much as digits as its factorization.

21113424403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 25.

Adding to 21113424403 its reverse (30442431112), we get a palindrome (51555855515).

The spelling of 21113424403 in words is "twenty-one billion, one hundred thirteen million, four hundred twenty-four thousand, four hundred three".