123123121103 has 4 divisors (see below), whose sum is σ = 124342162008. Its totient is φ = 121904080200.

The previous prime is 123123121097. The next prime is 123123121127. The reversal of 123123121103 is 301121321321.

It is a happy number.

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 123123121103 - 2⁶ = 123123121039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123123121153) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609520301 + ... + 609520502.

It is an arithmetic number, because the mean of its divisors is an integer number (31085540502).

Almost surely, 2^123123121103 is an apocalyptic number.

123123121103 is a deficient number, since it is larger than the sum of its proper divisors (1219040905).

123123121103 is a wasteful number, since it uses less digits than its factorization.

123123121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219040904.

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

Adding to 123123121103 its reverse (301121321321), we get a palindrome (424244442424).

The spelling of 123123121103 in words is "one hundred twenty-three billion, one hundred twenty-three million, one hundred twenty-one thousand, one hundred three".