231123121212 has 24 divisors (see below), whose sum is σ = 539835924096. Its totient is φ = 76962663088.

The previous prime is 231123121157. The next prime is 231123121231. The reversal of 231123121212 is 212121321132.

It is a super-3 number, since 3×231123121212³ (a number of 35 digits) contains 333 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 9784878 + ... + 9808469.

It is an arithmetic number, because the mean of its divisors is an integer number (22493163504).

Almost surely, 2^231123121212 is an apocalyptic number.

It is an amenable number.

231123121212 is an abundant number, since it is smaller than the sum of its proper divisors (308712802884).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231123121212 is a wasteful number, since it uses less digits than its factorization.

231123121212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19594337 (or 19594335 counting only the distinct ones).

The product of its digits is 288, while the sum is 21.

Adding to 231123121212 its reverse (212121321132), we get a palindrome (443244442344).

The spelling of 231123121212 in words is "two hundred thirty-one billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twelve".