123120320123 has 4 divisors (see below), whose sum is σ = 123831998448. Its totient is φ = 122408641800.

The previous prime is 123120320119. The next prime is 123120320153. The reversal of 123120320123 is 321023021321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 123120320123 - 2² = 123120320119 is a prime.

It is a super-2 number, since 2×123120320123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 123120320095 and 123120320104.

It is not an unprimeable number, because it can be changed into a prime (123120320153) 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 in 3 ways as a sum of consecutive naturals, for example, 355838903 + ... + 355839248.

It is an arithmetic number, because the mean of its divisors is an integer number (30957999612).

Almost surely, 2^123120320123 is an apocalyptic number.

123120320123 is a deficient number, since it is larger than the sum of its proper divisors (711678325).

123120320123 is an equidigital number, since it uses as much as digits as its factorization.

123120320123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711678324.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 123120320123 its reverse (321023021321), we get a palindrome (444143341444).

The spelling of 123120320123 in words is "one hundred twenty-three billion, one hundred twenty million, three hundred twenty thousand, one hundred twenty-three".