31212000013213 has 2 divisors, whose sum is σ = 31212000013214. Its totient is φ = 31212000013212.

The previous prime is 31212000013171. The next prime is 31212000013267. The reversal of 31212000013213 is 31231000021213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29737859217049 + 1474140796164 = 5453243^2 + 1214142^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31212000013213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31212000083213) 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, 15606000006606 + 15606000006607.

It is an arithmetic number, because the mean of its divisors is an integer number (15606000006607).

Almost surely, 2^{31212000013213} is an apocalyptic number.

It is an amenable number.

31212000013213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212000013213 is an equidigital number, since it uses as much as digits as its factorization.

31212000013213 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 19.

Adding to 31212000013213 its reverse (31231000021213), we get a palindrome (62443000034426).

The spelling of 31212000013213 in words is "thirty-one trillion, two hundred twelve billion, thirteen thousand, two hundred thirteen".