31212103131211 has 2 divisors, whose sum is σ = 31212103131212. Its totient is φ = 31212103131210.

The previous prime is 31212103131169. The next prime is 31212103131257. The reversal of 31212103131211 is 11213130121213.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 31212103131211 - 2²³ = 31212094742603 is a prime.

It is not a weakly prime, because it can be changed into another prime (31212103131281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606051565605 + 15606051565606.

It is an arithmetic number, because the mean of its divisors is an integer number (15606051565606).

Almost surely, 2^{31212103131211} is an apocalyptic number.

31212103131211 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212103131211 is an equidigital number, since it uses as much as digits as its factorization.

31212103131211 is an odious number, because the sum of its binary digits is odd.

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

Adding to 31212103131211 its reverse (11213130121213), we get a palindrome (42425233252424).

The spelling of 31212103131211 in words is "thirty-one trillion, two hundred twelve billion, one hundred three million, one hundred thirty-one thousand, two hundred eleven".