31111103321 has 2 divisors, whose sum is σ = 31111103322. Its totient is φ = 31111103320.

The previous prime is 31111103311. The next prime is 31111103323. The reversal of 31111103321 is 12330111113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29198265625 + 1912837696 = 170875^2 + 43736^2 .

It is a cyclic number.

It is not a de Polignac number, because 31111103321 - 2²² = 31106909017 is a prime.

It is a Sophie Germain prime.

Together with 31111103323, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31111103321.

It is not a weakly prime, because it can be changed into another prime (31111103323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555551660 + 15555551661.

It is an arithmetic number, because the mean of its divisors is an integer number (15555551661).

Almost surely, 2^31111103321 is an apocalyptic number.

It is an amenable number.

31111103321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31111103321 is an equidigital number, since it uses as much as digits as its factorization.

31111103321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 17.

Adding to 31111103321 its reverse (12330111113), we get a palindrome (43441214434).

The spelling of 31111103321 in words is "thirty-one billion, one hundred eleven million, one hundred three thousand, three hundred twenty-one".