31312021023 has 12 divisors (see below), whose sum is σ = 45395373088. Its totient is φ = 20797650720.

The previous prime is 31312020967. The next prime is 31312021049. The reversal of 31312021023 is 32012021313.

31312021023 is a `hidden beast` number, since 313 + 120 + 210 + 23 = 666.

It is not a de Polignac number, because 31312021023 - 2⁹ = 31312020511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31312020987 and 31312021005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312021093) 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 11 ways as a sum of consecutive naturals, for example, 6416590 + ... + 6421467.

Almost surely, 2^31312021023 is an apocalyptic number.

31312021023 is a deficient number, since it is larger than the sum of its proper divisors (14083352065).

31312021023 is a wasteful number, since it uses less digits than its factorization.

31312021023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12838334 (or 12838331 counting only the distinct ones).

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

Adding to 31312021023 its reverse (32012021313), we get a palindrome (63324042336).

The spelling of 31312021023 in words is "thirty-one billion, three hundred twelve million, twenty-one thousand, twenty-three".