123011323121 has 2 divisors, whose sum is σ = 123011323122. Its totient is φ = 123011323120.

The previous prime is 123011323079. The next prime is 123011323129. The reversal of 123011323121 is 121323110321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109140372496 + 13870950625 = 330364^2 + 117775^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123011323121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123011323093 and 123011323102.

It is not a weakly prime, because it can be changed into another prime (123011323129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61505661560 + 61505661561.

It is an arithmetic number, because the mean of its divisors is an integer number (61505661561).

Almost surely, 2^123011323121 is an apocalyptic number.

It is an amenable number.

123011323121 is a deficient number, since it is larger than the sum of its proper divisors (1).

123011323121 is an equidigital number, since it uses as much as digits as its factorization.

123011323121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 123011323121 its reverse (121323110321), we get a palindrome (244334433442).

The spelling of 123011323121 in words is "one hundred twenty-three billion, eleven million, three hundred twenty-three thousand, one hundred twenty-one".