123110321021 has 2 divisors, whose sum is σ = 123110321022. Its totient is φ = 123110321020.

The previous prime is 123110320871. The next prime is 123110321071. The reversal of 123110321021 is 120123011321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80173922500 + 42936398521 = 283150^2 + 207211^2 .

It is a cyclic number.

It is not a de Polignac number, because 123110321021 - 2²⁶ = 123043212157 is a prime.

It is a super-2 number, since 2×123110321021² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123110321071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61555160510 + 61555160511.

It is an arithmetic number, because the mean of its divisors is an integer number (61555160511).

Almost surely, 2^123110321021 is an apocalyptic number.

It is an amenable number.

123110321021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123110321021 is an equidigital number, since it uses as much as digits as its factorization.

123110321021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 123110321021 its reverse (120123011321), we get a palindrome (243233332342).

The spelling of 123110321021 in words is "one hundred twenty-three billion, one hundred ten million, three hundred twenty-one thousand, twenty-one".