121230311123 has 4 divisors (see below), whose sum is σ = 124049620728. Its totient is φ = 118411001520.

The previous prime is 121230311077. The next prime is 121230311171. The reversal of 121230311123 is 321113032121.

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 121230311123 - 2⁸ = 121230310867 is a prime.

It is a super-2 number, since 2×121230311123² (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 = 121230311095 and 121230311104.

It is not an unprimeable number, because it can be changed into a prime (121230311173) 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, 1409654738 + ... + 1409654823.

It is an arithmetic number, because the mean of its divisors is an integer number (31012405182).

Almost surely, 2^121230311123 is an apocalyptic number.

121230311123 is a deficient number, since it is larger than the sum of its proper divisors (2819309605).

121230311123 is an equidigital number, since it uses as much as digits as its factorization.

121230311123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2819309604.

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

Adding to 121230311123 its reverse (321113032121), we get a palindrome (442343343244).

The spelling of 121230311123 in words is "one hundred twenty-one billion, two hundred thirty million, three hundred eleven thousand, one hundred twenty-three".