31130121320 has 64 divisors (see below), whose sum is σ = 70450992000. Its totient is φ = 12379610880.

The previous prime is 31130121313. The next prime is 31130121371. The reversal of 31130121320 is 2312103113.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12211406 + ... + 12213954.

It is an arithmetic number, because the mean of its divisors is an integer number (1100796750).

Almost surely, 2^31130121320 is an apocalyptic number.

It is an amenable number.

31130121320 is an abundant number, since it is smaller than the sum of its proper divisors (39320870680).

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

31130121320 is a wasteful number, since it uses less digits than its factorization.

31130121320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4218 (or 4214 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31130121320 its reverse (2312103113), we get a palindrome (33442224433).

The spelling of 31130121320 in words is "thirty-one billion, one hundred thirty million, one hundred twenty-one thousand, three hundred twenty".