12121212323 has 4 divisors (see below), whose sum is σ = 13223140728. Its totient is φ = 11019283920.

The previous prime is 12121212287. The next prime is 12121212329. The reversal of 12121212323 is 32321212121.

12121212323 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

12121212323 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 12121212323 - 2⁸ = 12121212067 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12121212295 and 12121212304.

It is not an unprimeable number, because it can be changed into a prime (12121212329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550964186 + ... + 550964207.

It is an arithmetic number, because the mean of its divisors is an integer number (3305785182).

Almost surely, 2^12121212323 is an apocalyptic number.

12121212323 is a deficient number, since it is larger than the sum of its proper divisors (1101928405).

12121212323 is a wasteful number, since it uses less digits than its factorization.

12121212323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101928404.

The product of its digits is 288, while the sum is 20.

Adding to 12121212323 its reverse (32321212121), we get a palindrome (44442424444).

The spelling of 12121212323 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, three hundred twenty-three".