31031103321 has 20 divisors (see below), whose sum is σ = 46639511952. Its totient is φ = 20560476888.

The previous prime is 31031103307. The next prime is 31031103331. The reversal of 31031103321 is 12330113013.

It is a happy number.

31031103321 is a `hidden beast` number, since 31 + 0 + 311 + 0 + 3 + 321 = 666.

It is not a de Polignac number, because 31031103321 - 2¹⁹ = 31030579033 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31031103294 and 31031103303.

It is not an unprimeable number, because it can be changed into a prime (31031103331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1161951 + ... + 1188356.

Almost surely, 2^31031103321 is an apocalyptic number.

It is an amenable number.

31031103321 is a deficient number, since it is larger than the sum of its proper divisors (15608408631).

31031103321 is a wasteful number, since it uses less digits than its factorization.

31031103321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2350482 (or 2350473 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 18.

Adding to 31031103321 its reverse (12330113013), we get a palindrome (43361216334).

The spelling of 31031103321 in words is "thirty-one billion, thirty-one million, one hundred three thousand, three hundred twenty-one".