31103321312 has 96 divisors (see below), whose sum is σ = 75037777920. Its totient is φ = 12386949120.

The previous prime is 31103321299. The next prime is 31103321371. The reversal of 31103321312 is 21312330113.

It is a super-3 number, since 3×31103321312³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249137 + ... + 352527.

It is an arithmetic number, because the mean of its divisors is an integer number (781643520).

Almost surely, 2^31103321312 is an apocalyptic number.

31103321312 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31103321312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37518888960).

31103321312 is an abundant number, since it is smaller than the sum of its proper divisors (43934456608).

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

31103321312 is a wasteful number, since it uses less digits than its factorization.

31103321312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103504 (or 103496 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31103321312 its reverse (21312330113), we get a palindrome (52415651425).

The spelling of 31103321312 in words is "thirty-one billion, one hundred three million, three hundred twenty-one thousand, three hundred twelve".