231212330 has 64 divisors (see below), whose sum is σ = 461410560. Its totient is φ = 83026944.

The previous prime is 231212321. The next prime is 231212339. The reversal of 231212330 is 33212132.

It is an interprime number because it is at equal distance from previous prime (231212321) and next prime (231212339).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231212299 and 231212308.

It is not an unprimeable number, because it can be changed into a prime (231212339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 685922 + ... + 686258.

It is an arithmetic number, because the mean of its divisors is an integer number (7209540).

Almost surely, 2^231212330 is an apocalyptic number.

231212330 is a deficient number, since it is larger than the sum of its proper divisors (230198230).

231212330 is a wasteful number, since it uses less digits than its factorization.

231212330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 231212330 is about 15205.6676933307. The cubic root of 231212330 is about 613.7671824713.

Adding to 231212330 its reverse (33212132), we get a palindrome (264424462).

The spelling of 231212330 in words is "two hundred thirty-one million, two hundred twelve thousand, three hundred thirty".