31321210313 has 4 divisors (see below), whose sum is σ = 32331571968. Its totient is φ = 30310848660.

The previous prime is 31321210267. The next prime is 31321210337. The reversal of 31321210313 is 31301212313.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 31321210313 - 2²⁰ = 31320161737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31321215313) 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, 505180781 + ... + 505180842.

It is an arithmetic number, because the mean of its divisors is an integer number (8082892992).

Almost surely, 2^31321210313 is an apocalyptic number.

It is an amenable number.

31321210313 is a deficient number, since it is larger than the sum of its proper divisors (1010361655).

31321210313 is a wasteful number, since it uses less digits than its factorization.

31321210313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1010361654.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 31321210313 its reverse (31301212313), we get a palindrome (62622422626).

The spelling of 31321210313 in words is "thirty-one billion, three hundred twenty-one million, two hundred ten thousand, three hundred thirteen".