123121031023 has 2 divisors, whose sum is σ = 123121031024. Its totient is φ = 123121031022.

The previous prime is 123121031017. The next prime is 123121031051. The reversal of 123121031023 is 320130121321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123121031023 - 2²¹ = 123118933871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123121031063) 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, 61560515511 + 61560515512.

It is an arithmetic number, because the mean of its divisors is an integer number (61560515512).

Almost surely, 2^123121031023 is an apocalyptic number.

123121031023 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121031023 is an equidigital number, since it uses as much as digits as its factorization.

123121031023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 123121031023 its reverse (320130121321), we get a palindrome (443251152344).

The spelling of 123121031023 in words is "one hundred twenty-three billion, one hundred twenty-one million, thirty-one thousand, twenty-three".