31320212071 has 2 divisors, whose sum is σ = 31320212072. Its totient is φ = 31320212070.

The previous prime is 31320212069. The next prime is 31320212093. The reversal of 31320212071 is 17021202313.

It is a happy number.

It is an a-pointer prime, because the next prime (31320212093) can be obtained adding 31320212071 to its sum of digits (22).

It is a weak prime.

It is an emirp because it is prime and its reverse (17021202313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31320212071 - 2¹ = 31320212069 is a prime.

Together with 31320212069, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31320215071) 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 as a sum of consecutive naturals, namely, 15660106035 + 15660106036.

It is an arithmetic number, because the mean of its divisors is an integer number (15660106036).

Almost surely, 2^31320212071 is an apocalyptic number.

31320212071 is a deficient number, since it is larger than the sum of its proper divisors (1).

31320212071 is an equidigital number, since it uses as much as digits as its factorization.

31320212071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 22.

Adding to 31320212071 its reverse (17021202313), we get a palindrome (48341414384).

The spelling of 31320212071 in words is "thirty-one billion, three hundred twenty million, two hundred twelve thousand, seventy-one".