123231213 has 20 divisors (see below), whose sum is σ = 210385120. Its totient is φ = 70417512.

The previous prime is 123231209. The next prime is 123231223. The reversal of 123231213 is 312132321.

It is not a de Polignac number, because 123231213 - 2² = 123231209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123231203) 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 19 ways as a sum of consecutive naturals, for example, 108103 + ... + 109236.

It is an arithmetic number, because the mean of its divisors is an integer number (10519256).

Almost surely, 2^123231213 is an apocalyptic number.

It is an amenable number.

123231213 is a deficient number, since it is larger than the sum of its proper divisors (87153907).

123231213 is an equidigital number, since it uses as much as digits as its factorization.

123231213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217358 (or 217349 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 123231213 is about 11100.9554994154. The cubic root of 123231213 is about 497.6304051138.

Adding to 123231213 its reverse (312132321), we get a palindrome (435363534).

The spelling of 123231213 in words is "one hundred twenty-three million, two hundred thirty-one thousand, two hundred thirteen".