123123021173 has 2 divisors, whose sum is σ = 123123021174. Its totient is φ = 123123021172.

The previous prime is 123123021167. The next prime is 123123021293. The reversal of 123123021173 is 371120321321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120674948689 + 2448072484 = 347383^2 + 49478^2 .

It is a cyclic number.

It is not a de Polignac number, because 123123021173 - 2¹² = 123123017077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123123021143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61561510586 + 61561510587.

It is an arithmetic number, because the mean of its divisors is an integer number (61561510587).

Almost surely, 2^123123021173 is an apocalyptic number.

It is an amenable number.

123123021173 is a deficient number, since it is larger than the sum of its proper divisors (1).

123123021173 is an equidigital number, since it uses as much as digits as its factorization.

123123021173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 26.

Adding to 123123021173 its reverse (371120321321), we get a palindrome (494243342494).

The spelling of 123123021173 in words is "one hundred twenty-three billion, one hundred twenty-three million, twenty-one thousand, one hundred seventy-three".