31212103211 has 2 divisors, whose sum is σ = 31212103212. Its totient is φ = 31212103210.

The previous prime is 31212103201. The next prime is 31212103213. The reversal of 31212103211 is 11230121213.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 31212103211 - 2³⁰ = 30138361387 is a prime.

Together with 31212103213, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31212103211.

It is not a weakly prime, because it can be changed into another prime (31212103213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606051605 + 15606051606.

It is an arithmetic number, because the mean of its divisors is an integer number (15606051606).

Almost surely, 2^31212103211 is an apocalyptic number.

31212103211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212103211 is an equidigital number, since it uses as much as digits as its factorization.

31212103211 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 17.

Adding to 31212103211 its reverse (11230121213), we get a palindrome (42442224424).

The spelling of 31212103211 in words is "thirty-one billion, two hundred twelve million, one hundred three thousand, two hundred eleven".