31212130331071 has 2 divisors, whose sum is σ = 31212130331072. Its totient is φ = 31212130331070.

The previous prime is 31212130331017. The next prime is 31212130331087. The reversal of 31212130331071 is 17013303121213.

Together with previous prime (31212130331017) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212130331071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212130331771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606065165535 + 15606065165536.

It is an arithmetic number, because the mean of its divisors is an integer number (15606065165536).

Almost surely, 2^{31212130331071} is an apocalyptic number.

31212130331071 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212130331071 is an equidigital number, since it uses as much as digits as its factorization.

31212130331071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 28.

Adding to 31212130331071 its reverse (17013303121213), we get a palindrome (48225433452284).

The spelling of 31212130331071 in words is "thirty-one trillion, two hundred twelve billion, one hundred thirty million, three hundred thirty-one thousand, seventy-one".