31223244321 has 12 divisors (see below), whose sum is σ = 45101873700. Its totient is φ = 20814743040.

The previous prime is 31223244319. The next prime is 31223244343. The reversal of 31223244321 is 12344232213.

31223244321 is a `hidden beast` number, since 3 + 1 + 223 + 2 + 4 + 432 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6962066721 + 24261177600 = 83439^2 + 155760^2 .

It is not a de Polignac number, because 31223244321 - 2¹ = 31223244319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31223204321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327505 + ... + 411953.

It is an arithmetic number, because the mean of its divisors is an integer number (3758489475).

Almost surely, 2^31223244321 is an apocalyptic number.

It is an amenable number.

31223244321 is a deficient number, since it is larger than the sum of its proper divisors (13878629379).

31223244321 is a wasteful number, since it uses less digits than its factorization.

31223244321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125536 (or 125533 counting only the distinct ones).

The product of its digits is 6912, while the sum is 27.

Adding to 31223244321 its reverse (12344232213), we get a palindrome (43567476534).

The spelling of 31223244321 in words is "thirty-one billion, two hundred twenty-three million, two hundred forty-four thousand, three hundred twenty-one".