31112321100 has 144 divisors (see below), whose sum is σ = 105387588096. Its totient is φ = 6937920000.

The previous prime is 31112321087. The next prime is 31112321101. The reversal of 31112321100 is 112321113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 31112321100.

It is not an unprimeable number, because it can be changed into a prime (31112321101) 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 47 ways as a sum of consecutive naturals, for example, 94576 + ... + 266775.

Almost surely, 2^31112321100 is an apocalyptic number.

31112321100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31112321100 is an abundant number, since it is smaller than the sum of its proper divisors (74275266996).

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

31112321100 is a wasteful number, since it uses less digits than its factorization.

31112321100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361416 (or 361409 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 31112321100 its reverse (112321113), we get a palindrome (31224642213).

The spelling of 31112321100 in words is "thirty-one billion, one hundred twelve million, three hundred twenty-one thousand, one hundred".