31213211233213 has 2 divisors, whose sum is σ = 31213211233214. Its totient is φ = 31213211233212.

The previous prime is 31213211233207. The next prime is 31213211233223. The reversal of 31213211233213 is 31233211231213.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27698137461604 + 3515073771609 = 5262902^2 + 1874853^2 .

It is a cyclic number.

It is not a de Polignac number, because 31213211233213 - 2⁵ = 31213211233181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31213211233223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15606605616606 + 15606605616607.

It is an arithmetic number, because the mean of its divisors is an integer number (15606605616607).

Almost surely, 2^{31213211233213} is an apocalyptic number.

It is an amenable number.

31213211233213 is a deficient number, since it is larger than the sum of its proper divisors (1).

31213211233213 is an equidigital number, since it uses as much as digits as its factorization.

31213211233213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

Adding to 31213211233213 its reverse (31233211231213), we get a palindrome (62446422464426).

It can be divided in two parts, 3121321 and 1233213, that added together give a palindrome (4354534).

The spelling of 31213211233213 in words is "thirty-one trillion, two hundred thirteen billion, two hundred eleven million, two hundred thirty-three thousand, two hundred thirteen".