31110113312221 has 2 divisors, whose sum is σ = 31110113312222. Its totient is φ = 31110113312220.

The previous prime is 31110113312171. The next prime is 31110113312231. The reversal of 31110113312221 is 12221331101113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25187650812900 + 5922462499321 = 5018730^2 + 2433611^2 .

It is an emirp because it is prime and its reverse (12221331101113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31110113312221 - 2¹⁷ = 31110113181149 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31110113312192 and 31110113312201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31110113312231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15555056656110 + 15555056656111.

It is an arithmetic number, because the mean of its divisors is an integer number (15555056656111).

Almost surely, 2^{31110113312221} is an apocalyptic number.

It is an amenable number.

31110113312221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31110113312221 is an equidigital number, since it uses as much as digits as its factorization.

31110113312221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31110113312221 its reverse (12221331101113), we get a palindrome (43331444413334).

The spelling of 31110113312221 in words is "thirty-one trillion, one hundred ten billion, one hundred thirteen million, three hundred twelve thousand, two hundred twenty-one".