31313121200320 has 56 divisors (see below), whose sum is σ = 75288295858464. Its totient is φ = 12403644112896.

The previous prime is 31313121200233. The next prime is 31313121200369. The reversal of 31313121200320 is 2300212131313.

It is a junction number, because it is equal to n+sod(n) for n = 31313121200291 and 31313121200300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474984049 + ... + 475049968.

Almost surely, 2^{31313121200320} is an apocalyptic number.

It is an amenable number.

31313121200320 is an abundant number, since it is smaller than the sum of its proper divisors (43975174658144).

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

31313121200320 is a wasteful number, since it uses less digits than its factorization.

31313121200320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950034137 (or 950034127 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 31313121200320 its reverse (2300212131313), we get a palindrome (33613333331633).

The spelling of 31313121200320 in words is "thirty-one trillion, three hundred thirteen billion, one hundred twenty-one million, two hundred thousand, three hundred twenty".