31121100321211 has 2 divisors, whose sum is σ = 31121100321212. Its totient is φ = 31121100321210.

The previous prime is 31121100321209. The next prime is 31121100321263. The reversal of 31121100321211 is 11212300112113.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31121100321211 - 2¹ = 31121100321209 is a prime.

Together with 31121100321209, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (31121100321271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15560550160605 + 15560550160606.

It is an arithmetic number, because the mean of its divisors is an integer number (15560550160606).

Almost surely, 2^{31121100321211} is an apocalyptic number.

31121100321211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31121100321211 is an equidigital number, since it uses as much as digits as its factorization.

31121100321211 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 31121100321211 its reverse (11212300112113), we get a palindrome (42333400433324).

The spelling of 31121100321211 in words is "thirty-one trillion, one hundred twenty-one billion, one hundred million, three hundred twenty-one thousand, two hundred eleven".