31000011110221 has 2 divisors, whose sum is σ = 31000011110222. Its totient is φ = 31000011110220.

The previous prime is 31000011110203. The next prime is 31000011110239. The reversal of 31000011110221 is 12201111000013.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (31000011110203) and next prime (31000011110239).

It can be written as a sum of positive squares in only one way, i.e., 28522125853321 + 2477885256900 = 5340611^2 + 1574130^2 .

It is a cyclic number.

It is not a de Polignac number, because 31000011110221 - 2³⁹ = 30450255296333 is a prime.

It is a super-3 number, since 3×31000011110221³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31000011110821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15500005555110 + 15500005555111.

It is an arithmetic number, because the mean of its divisors is an integer number (15500005555111).

Almost surely, 2^{31000011110221} is an apocalyptic number.

It is an amenable number.

31000011110221 is a deficient number, since it is larger than the sum of its proper divisors (1).

31000011110221 is an equidigital number, since it uses as much as digits as its factorization.

31000011110221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 31000011110221 its reverse (12201111000013), we get a palindrome (43201122110234).

The spelling of 31000011110221 in words is "thirty-one trillion, eleven million, one hundred ten thousand, two hundred twenty-one".