123021313021 has 2 divisors, whose sum is σ = 123021313022. Its totient is φ = 123021313020.

The previous prime is 123021313007. The next prime is 123021313039. The reversal of 123021313021 is 120313120321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107079472900 + 15941840121 = 327230^2 + 126261^2 .

It is a cyclic number.

It is not a de Polignac number, because 123021313021 - 2²³ = 123012924413 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123021313021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123021313001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61510656510 + 61510656511.

It is an arithmetic number, because the mean of its divisors is an integer number (61510656511).

Almost surely, 2^123021313021 is an apocalyptic number.

It is an amenable number.

123021313021 is a deficient number, since it is larger than the sum of its proper divisors (1).

123021313021 is an equidigital number, since it uses as much as digits as its factorization.

123021313021 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 123021313021 its reverse (120313120321), we get a palindrome (243334433342).

The spelling of 123021313021 in words is "one hundred twenty-three billion, twenty-one million, three hundred thirteen thousand, twenty-one".