123212123 has 4 divisors (see below), whose sum is σ = 124039200. Its totient is φ = 122385048.

The previous prime is 123212087. The next prime is 123212143. The reversal of 123212123 is 321212321.

123212123 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 123212123 - 2⁶ = 123212059 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123212143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413315 + ... + 413612.

It is an arithmetic number, because the mean of its divisors is an integer number (31009800).

Almost surely, 2^123212123 is an apocalyptic number.

123212123 is a deficient number, since it is larger than the sum of its proper divisors (827077).

123212123 is an equidigital number, since it uses as much as digits as its factorization.

123212123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827076.

The product of its digits is 144, while the sum is 17.

The square root of 123212123 is about 11100.0956302187. The cubic root of 123212123 is about 497.6047074712.

Adding to 123212123 its reverse (321212321), we get a palindrome (444424444).

The spelling of 123212123 in words is "one hundred twenty-three million, two hundred twelve thousand, one hundred twenty-three".