31212031131331 has 4 divisors (see below), whose sum is σ = 32569075963152. Its totient is φ = 29854986299512.

The previous prime is 31212031131319. The next prime is 31212031131341. The reversal of 31212031131331 is 13313113021213.

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

It is a cyclic number.

It is not a de Polignac number, because 31212031131331 - 2¹¹ = 31212031129283 is a prime.

It is a super-2 number, since 2×31212031131331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31212031131296 and 31212031131305.

It is not an unprimeable number, because it can be changed into a prime (31212031131311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 678522415876 + ... + 678522415921.

It is an arithmetic number, because the mean of its divisors is an integer number (8142268990788).

Almost surely, 2^{31212031131331} is an apocalyptic number.

31212031131331 is a deficient number, since it is larger than the sum of its proper divisors (1357044831821).

31212031131331 is a wasteful number, since it uses less digits than its factorization.

31212031131331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1357044831820.

The product of its (nonzero) digits is 972, while the sum is 25.

Adding to 31212031131331 its reverse (13313113021213), we get a palindrome (44525144152544).

The spelling of 31212031131331 in words is "thirty-one trillion, two hundred twelve billion, thirty-one million, one hundred thirty-one thousand, three hundred thirty-one".