21100120232123 has 2 divisors, whose sum is σ = 21100120232124. Its totient is φ = 21100120232122.

The previous prime is 21100120232083. The next prime is 21100120232137. The reversal of 21100120232123 is 32123202100112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21100120232123 - 2⁴⁴ = 3507934187707 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21100120232095 and 21100120232104.

It is not a weakly prime, because it can be changed into another prime (21100120232623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10550060116061 + 10550060116062.

It is an arithmetic number, because the mean of its divisors is an integer number (10550060116062).

Almost surely, 2^{21100120232123} is an apocalyptic number.

21100120232123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21100120232123 is an equidigital number, since it uses as much as digits as its factorization.

21100120232123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21100120232123 its reverse (32123202100112), we get a palindrome (53223322332235).

The spelling of 21100120232123 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, two hundred thirty-two thousand, one hundred twenty-three".