123124315621 has 2 divisors, whose sum is σ = 123124315622. Its totient is φ = 123124315620.

The previous prime is 123124315609. The next prime is 123124315663. The reversal of 123124315621 is 126513421321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123120984996 + 3330625 = 350886^2 + 1825^2 .

It is a cyclic number.

It is not a de Polignac number, because 123124315621 - 2⁷ = 123124315493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123124415621) 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, 61562157810 + 61562157811.

It is an arithmetic number, because the mean of its divisors is an integer number (61562157811).

Almost surely, 2^123124315621 is an apocalyptic number.

It is an amenable number.

123124315621 is a deficient number, since it is larger than the sum of its proper divisors (1).

123124315621 is an equidigital number, since it uses as much as digits as its factorization.

123124315621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

Adding to 123124315621 its reverse (126513421321), we get a palindrome (249637736942).

The spelling of 123124315621 in words is "one hundred twenty-three billion, one hundred twenty-four million, three hundred fifteen thousand, six hundred twenty-one".