123121103 has 4 divisors (see below), whose sum is σ = 140709840. Its totient is φ = 105532368.

The previous prime is 123121099. The next prime is 123121109. The reversal of 123121103 is 301121321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 301121321 = 31 ⋅9713591.

It is a cyclic number.

It is not a de Polignac number, because 123121103 - 2² = 123121099 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 (123121109) 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, 8794358 + ... + 8794371.

It is an arithmetic number, because the mean of its divisors is an integer number (35177460).

Almost surely, 2^123121103 is an apocalyptic number.

123121103 is a deficient number, since it is larger than the sum of its proper divisors (17588737).

123121103 is an equidigital number, since it uses as much as digits as its factorization.

123121103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17588736.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 123121103 is about 11095.9949080738. The cubic root of 123121103 is about 497.4821461064.

Adding to 123121103 its reverse (301121321), we get a palindrome (424242424).

The spelling of 123121103 in words is "one hundred twenty-three million, one hundred twenty-one thousand, one hundred three".