21113202503423 has 2 divisors, whose sum is σ = 21113202503424. Its totient is φ = 21113202503422.

The previous prime is 21113202503417. The next prime is 21113202503501. The reversal of 21113202503423 is 32430520231112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21113202503423 - 2²⁰ = 21113201454847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21113202523423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556601251711 + 10556601251712.

It is an arithmetic number, because the mean of its divisors is an integer number (10556601251712).

Almost surely, 2^{21113202503423} is an apocalyptic number.

21113202503423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21113202503423 is an equidigital number, since it uses as much as digits as its factorization.

21113202503423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 29.

Adding to 21113202503423 its reverse (32430520231112), we get a palindrome (53543722734535).

The spelling of 21113202503423 in words is "twenty-one trillion, one hundred thirteen billion, two hundred two million, five hundred three thousand, four hundred twenty-three".