121303112123 has 4 divisors (see below), whose sum is σ = 121346608320. Its totient is φ = 121259615928.

The previous prime is 121303112089. The next prime is 121303112141. The reversal of 121303112123 is 321211303121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321211303121 = 19 ⋅16905858059.

It is a cyclic number.

It is not a de Polignac number, because 121303112123 - 2¹² = 121303108027 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121303112095 and 121303112104.

It is not an unprimeable number, because it can be changed into a prime (121303111123) 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, 21743915 + ... + 21749492.

It is an arithmetic number, because the mean of its divisors is an integer number (30336652080).

Almost surely, 2^121303112123 is an apocalyptic number.

121303112123 is a deficient number, since it is larger than the sum of its proper divisors (43496197).

121303112123 is an equidigital number, since it uses as much as digits as its factorization.

121303112123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43496196.

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

Adding to 121303112123 its reverse (321211303121), we get a palindrome (442514415244).

The spelling of 121303112123 in words is "one hundred twenty-one billion, three hundred three million, one hundred twelve thousand, one hundred twenty-three".