12121212123 has 6 divisors (see below), whose sum is σ = 17508417524. Its totient is φ = 8080808076.

The previous prime is 12121212121. The next prime is 12121212139. The reversal of 12121212123 is 32121212121.

12121212123 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 12121212123 - 2¹ = 12121212121 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 = 12121212096 and 12121212105.

It is not an unprimeable number, because it can be changed into a prime (12121212121) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 673400665 + ... + 673400682.

Almost surely, 2^12121212123 is an apocalyptic number.

12121212123 is a deficient number, since it is larger than the sum of its proper divisors (5387205401).

12121212123 is a wasteful number, since it uses less digits than its factorization.

12121212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346801353 (or 1346801350 counting only the distinct ones).

The product of its digits is 96, while the sum is 18.

Adding to 12121212123 its reverse (32121212121), we get a palindrome (44242424244).

The spelling of 12121212123 in words is "twelve billion, one hundred twenty-one million, two hundred twelve thousand, one hundred twenty-three".