31313200102321 has 4 divisors (see below), whose sum is σ = 31443130393444. Its totient is φ = 31183269811200.

The previous prime is 31313200102297. The next prime is 31313200102361. The reversal of 31313200102321 is 12320100231313.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 23816205634225 + 7496994468096 = 4880185^2 + 2738064^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313200102321 - 2³¹ = 31311052618673 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31313200102292 and 31313200102301.

It is not an unprimeable number, because it can be changed into a prime (31313200102361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64965145200 + ... + 64965145681.

It is an arithmetic number, because the mean of its divisors is an integer number (7860782598361).

Almost surely, 2^{31313200102321} is an apocalyptic number.

It is an amenable number.

31313200102321 is a deficient number, since it is larger than the sum of its proper divisors (129930291123).

31313200102321 is a wasteful number, since it uses less digits than its factorization.

31313200102321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129930291122.

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

Adding to 31313200102321 its reverse (12320100231313), we get a palindrome (43633300333634).

The spelling of 31313200102321 in words is "thirty-one trillion, three hundred thirteen billion, two hundred million, one hundred two thousand, three hundred twenty-one".