31121321100000 has 144 divisors (see below), whose sum is σ = 102110300366256. Its totient is φ = 8299018880000.

The previous prime is 31121321099933. The next prime is 31121321100011. The reversal of 31121321100000 is 112312113.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51568869 + ... + 52168868.

It is an arithmetic number, because the mean of its divisors is an integer number (709099308099).

Almost surely, 2^{31121321100000} is an apocalyptic number.

31121321100000 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31121321100000 is an abundant number, since it is smaller than the sum of its proper divisors (70988979266256).

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

31121321100000 is an equidigital number, since it uses as much as digits as its factorization.

31121321100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103737775 (or 103737747 counting only the distinct ones).

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

Adding to 31121321100000 its reverse (112312113), we get a palindrome (31121433412113).

The spelling of 31121321100000 in words is "thirty-one trillion, one hundred twenty-one billion, three hundred twenty-one million, one hundred thousand".