31120221120 has 112 divisors (see below), whose sum is σ = 98877851520. Its totient is φ = 8292750336.

The previous prime is 31120221089. The next prime is 31120221149. The reversal of 31120221120 is 2112202113.

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 31120221120.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1412751 + ... + 1434609.

It is an arithmetic number, because the mean of its divisors is an integer number (882837960).

Almost surely, 2^31120221120 is an apocalyptic number.

31120221120 is a gapful number since it is divisible by the number (30) 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 31120221120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49438925760).

31120221120 is an abundant number, since it is smaller than the sum of its proper divisors (67757630400).

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

31120221120 is a wasteful number, since it uses less digits than its factorization.

31120221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23362 (or 23352 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 31120221120 its reverse (2112202113), we get a palindrome (33232423233).

The spelling of 31120221120 in words is "thirty-one billion, one hundred twenty million, two hundred twenty-one thousand, one hundred twenty".