21023112304123 has 2 divisors, whose sum is σ = 21023112304124. Its totient is φ = 21023112304122.

The previous prime is 21023112304109. The next prime is 21023112304163. The reversal of 21023112304123 is 32140321132012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21023112304123 - 2¹³ = 21023112295931 is a prime.

It is not a weakly prime, because it can be changed into another prime (21023112304163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511556152061 + 10511556152062.

It is an arithmetic number, because the mean of its divisors is an integer number (10511556152062).

Almost surely, 2^{21023112304123} is an apocalyptic number.

21023112304123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21023112304123 is an equidigital number, since it uses as much as digits as its factorization.

21023112304123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21023112304123 its reverse (32140321132012), we get a palindrome (53163433436135).

The spelling of 21023112304123 in words is "twenty-one trillion, twenty-three billion, one hundred twelve million, three hundred four thousand, one hundred twenty-three".