31320302120 has 16 divisors (see below), whose sum is σ = 70470679860. Its totient is φ = 12528120832.

The previous prime is 31320302081. The next prime is 31320302171. The reversal of 31320302120 is 2120302313.

It can be written as a sum of positive squares in 2 ways, for example, as 27510203044 + 3810099076 = 165862^2 + 61726^2 .

It is a super-2 number, since 2×31320302120² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391503737 + ... + 391503816.

Almost surely, 2^31320302120 is an apocalyptic number.

It is an amenable number.

31320302120 is an abundant number, since it is smaller than the sum of its proper divisors (39150377740).

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

31320302120 is a wasteful number, since it uses less digits than its factorization.

31320302120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783007564 (or 783007560 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 31320302120 its reverse (2120302313), we get a palindrome (33440604433).

The spelling of 31320302120 in words is "thirty-one billion, three hundred twenty million, three hundred two thousand, one hundred twenty".