31816324212 has 192 divisors, whose sum is σ = 82301184000. Its totient is φ = 9533235712.

The previous prime is 31816324207. The next prime is 31816324213. The reversal of 31816324212 is 21242361813.

It is a super-4 number, since 4×31816324212⁴ (a number of 43 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31816324213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 75933739 + ... + 75934157.

It is an arithmetic number, because the mean of its divisors is an integer number (428652000).

Almost surely, 2^31816324212 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 31816324212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41150592000).

31816324212 is an abundant number, since it is smaller than the sum of its proper divisors (50484859788).

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

31816324212 is a wasteful number, since it uses less digits than its factorization.

31816324212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 710 (or 708 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The spelling of 31816324212 in words is "thirty-one billion, eight hundred sixteen million, three hundred twenty-four thousand, two hundred twelve".