31103031220000 has 120 divisors (see below), whose sum is σ = 76530632758272. Its totient is φ = 12439178400000.

The previous prime is 31103031219929. The next prime is 31103031220003. The reversal of 31103031220000 is 2213030113.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (31103031220003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 125296005 + ... + 125543995.

Almost surely, 2^{31103031220000} 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 31103031220000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38265316379136).

31103031220000 is an abundant number, since it is smaller than the sum of its proper divisors (45427601538272).

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

31103031220000 is an equidigital number, since it uses as much as digits as its factorization.

31103031220000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254292 (or 254269 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 16.

Adding to 31103031220000 its reverse (2213030113), we get a palindrome (31105244250113).

The spelling of 31103031220000 in words is "thirty-one trillion, one hundred three billion, thirty-one million, two hundred twenty thousand".