31223131222113 has 24 divisors (see below), whose sum is σ = 45515966496000. Its totient is φ = 20623490318304.

The previous prime is 31223131222111. The next prime is 31223131222117. The reversal of 31223131222113 is 31122213132213.

31223131222113 is a `hidden beast` number, since 3 + 1 + 2 + 231 + 312 + 2 + 2 + 113 = 666.

It is not a de Polignac number, because 31223131222113 - 2¹ = 31223131222111 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31223131222111) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20581738 + ... + 22046636.

It is an arithmetic number, because the mean of its divisors is an integer number (1896498604000).

Almost surely, 2^{31223131222113} is an apocalyptic number.

It is an amenable number.

31223131222113 is a deficient number, since it is larger than the sum of its proper divisors (14292835273887).

31223131222113 is a wasteful number, since it uses less digits than its factorization.

31223131222113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486741 (or 1486738 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

Adding to 31223131222113 its reverse (31122213132213), we get a palindrome (62345344354326).

The spelling of 31223131222113 in words is "thirty-one trillion, two hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-two thousand, one hundred thirteen".