312123212 has 12 divisors (see below), whose sum is σ = 546942480. Its totient is φ = 155853936.

The previous prime is 312123211. The next prime is 312123239. The reversal of 312123212 is 212321213.

It is not an unprimeable number, because it can be changed into a prime (312123211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48512 + ... + 54567.

It is an arithmetic number, because the mean of its divisors is an integer number (45578540).

Almost surely, 2^312123212 is an apocalyptic number.

It is an amenable number.

312123212 is a deficient number, since it is larger than the sum of its proper divisors (234819268).

312123212 is a wasteful number, since it uses less digits than its factorization.

312123212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103840 (or 103838 counting only the distinct ones).

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

The square root of 312123212 is about 17667.0091413346. The cubic root of 312123212 is about 678.3315584647.

Adding to 312123212 its reverse (212321213), we get a palindrome (524444425).

The spelling of 312123212 in words is "three hundred twelve million, one hundred twenty-three thousand, two hundred twelve".