31012320321 has 12 divisors (see below), whose sum is σ = 44838701440. Its totient is φ = 20654975160.

The previous prime is 31012320289. The next prime is 31012320349. The reversal of 31012320321 is 12302321013.

31012320321 is a `hidden beast` number, since 3 + 10 + 12 + 320 + 321 = 666.

It is not a de Polignac number, because 31012320321 - 2⁵ = 31012320289 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31012320294 and 31012320303.

It is not an unprimeable number, because it can be changed into a prime (31012420321) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1648885 + ... + 1667586.

Almost surely, 2^31012320321 is an apocalyptic number.

It is an amenable number.

31012320321 is a deficient number, since it is larger than the sum of its proper divisors (13826381119).

31012320321 is a wasteful number, since it uses less digits than its factorization.

31012320321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317516 (or 3317513 counting only the distinct ones).

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

Adding to 31012320321 its reverse (12302321013), we get a palindrome (43314641334).

The spelling of 31012320321 in words is "thirty-one billion, twelve million, three hundred twenty thousand, three hundred twenty-one".