31103302120 has 128 divisors (see below), whose sum is σ = 76958294400. Its totient is φ = 11219788800.

The previous prime is 31103302039. The next prime is 31103302123. The reversal of 31103302120 is 2120330113.

It is a junction number, because it is equal to n+sod(n) for n = 31103302094 and 31103302103.

It is not an unprimeable number, because it can be changed into a prime (31103302123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47054590 + ... + 47055250.

It is an arithmetic number, because the mean of its divisors is an integer number (601236675).

Almost surely, 2^31103302120 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 31103302120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38479147200).

31103302120 is an abundant number, since it is smaller than the sum of its proper divisors (45854992280).

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

31103302120 is a wasteful number, since it uses less digits than its factorization.

31103302120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379 (or 1375 counting only the distinct ones).

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

Adding to 31103302120 its reverse (2120330113), we get a palindrome (33223632233).

The spelling of 31103302120 in words is "thirty-one billion, one hundred three million, three hundred two thousand, one hundred twenty".