21112665504223 has 2 divisors, whose sum is σ = 21112665504224. Its totient is φ = 21112665504222.

The previous prime is 21112665504193. The next prime is 21112665504379. The reversal of 21112665504223 is 32240556621112.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21112665504223 - 2⁵ = 21112665504191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112665504023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556332752111 + 10556332752112.

It is an arithmetic number, because the mean of its divisors is an integer number (10556332752112).

Almost surely, 2^{21112665504223} is an apocalyptic number.

21112665504223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112665504223 is an equidigital number, since it uses as much as digits as its factorization.

21112665504223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 21112665504223 in words is "twenty-one trillion, one hundred twelve billion, six hundred sixty-five million, five hundred four thousand, two hundred twenty-three".