31223310120 has 96 divisors (see below), whose sum is σ = 101991094920. Its totient is φ = 8283932160.

The previous prime is 31223310119. The next prime is 31223310163. The reversal of 31223310120 is 2101332213.

31223310120 is a `hidden beast` number, since 312 + 2 + 331 + 0 + 1 + 20 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 30971072196 + 252237924 = 175986^2 + 15882^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 31223310093 and 31223310102.

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 23 ways as a sum of consecutive naturals, for example, 149211 + ... + 291050.

Almost surely, 2^31223310120 is an apocalyptic number.

31223310120 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31223310120 is an abundant number, since it is smaller than the sum of its proper divisors (70767784800).

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

31223310120 is a wasteful number, since it uses less digits than its factorization.

31223310120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440475 (or 440468 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31223310120 its reverse (2101332213), we get a palindrome (33324642333).

The spelling of 31223310120 in words is "thirty-one billion, two hundred twenty-three million, three hundred ten thousand, one hundred twenty".