31231323213012 has 192 divisors, whose sum is σ = 88812818304000. Its totient is φ = 9433147216896.

The previous prime is 31231323213007. The next prime is 31231323213019. The reversal of 31231323213012 is 21031232313213.

31231323213012 is a `hidden beast` number, since 3 + 1 + 2 + 3 + 1 + 32 + 321 + 301 + 2 = 666.

It is a super-2 number, since 2×31231323213012² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31231323213019) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 18374664 + ... + 20002272.

It is an arithmetic number, because the mean of its divisors is an integer number (462566762000).

Almost surely, 2^{31231323213012} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31231323213012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44406409152000).

31231323213012 is an abundant number, since it is smaller than the sum of its proper divisors (57581495090988).

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

31231323213012 is a wasteful number, since it uses less digits than its factorization.

31231323213012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627887 (or 1627879 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31231323213012 its reverse (21031232313213), we get a palindrome (52262555526225).

The spelling of 31231323213012 in words is "thirty-one trillion, two hundred thirty-one billion, three hundred twenty-three million, two hundred thirteen thousand, twelve".