20331112313231 has 2 divisors, whose sum is σ = 20331112313232. Its totient is φ = 20331112313230.

The previous prime is 20331112313129. The next prime is 20331112313233. The reversal of 20331112313231 is 13231321113302.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331112313231 is a prime.

It is a super-2 number, since 2×20331112313231² (a number of 27 digits) contains 22 as substring.

Together with 20331112313233, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20331112313231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20331112313233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10165556156615 + 10165556156616.

It is an arithmetic number, because the mean of its divisors is an integer number (10165556156616).

Almost surely, 2^{20331112313231} is an apocalyptic number.

20331112313231 is a deficient number, since it is larger than the sum of its proper divisors (1).

20331112313231 is an equidigital number, since it uses as much as digits as its factorization.

20331112313231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1944, while the sum is 26.

Adding to 20331112313231 its reverse (13231321113302), we get a palindrome (33562433426533).

The spelling of 20331112313231 in words is "twenty trillion, three hundred thirty-one billion, one hundred twelve million, three hundred thirteen thousand, two hundred thirty-one".