12121123123 has 4 divisors (see below), whose sum is σ = 12121629520. Its totient is φ = 12120616728.

The previous prime is 12121123081. The next prime is 12121123193. The reversal of 12121123123 is 32132112121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32132112121 = 67 ⋅479583763.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12121123123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12121123123.

It is not an unprimeable number, because it can be changed into a prime (12121123193) 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, 215415 + ... + 265792.

It is an arithmetic number, because the mean of its divisors is an integer number (3030407380).

Almost surely, 2^12121123123 is an apocalyptic number.

12121123123 is a deficient number, since it is larger than the sum of its proper divisors (506397).

12121123123 is an equidigital number, since it uses as much as digits as its factorization.

12121123123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506396.

The product of its digits is 144, while the sum is 19.

Adding to 12121123123 its reverse (32132112121), we get a palindrome (44253235244).

The spelling of 12121123123 in words is "twelve billion, one hundred twenty-one million, one hundred twenty-three thousand, one hundred twenty-three".