31212102211321 has 2 divisors, whose sum is σ = 31212102211322. Its totient is φ = 31212102211320.

The previous prime is 31212102211271. The next prime is 31212102211349. The reversal of 31212102211321 is 12311220121213.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25295508127296 + 5916594084025 = 5029464^2 + 2432405^2 .

It is a cyclic number.

It is not a de Polignac number, because 31212102211321 - 2¹¹ = 31212102209273 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31212102211292 and 31212102211301.

It is not a weakly prime, because it can be changed into another prime (31212102211921) 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, 15606051105660 + 15606051105661.

It is an arithmetic number, because the mean of its divisors is an integer number (15606051105661).

Almost surely, 2^{31212102211321} is an apocalyptic number.

It is an amenable number.

31212102211321 is a deficient number, since it is larger than the sum of its proper divisors (1).

31212102211321 is an equidigital number, since it uses as much as digits as its factorization.

31212102211321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 31212102211321 its reverse (12311220121213), we get a palindrome (43523322332534).

The spelling of 31212102211321 in words is "thirty-one trillion, two hundred twelve billion, one hundred two million, two hundred eleven thousand, three hundred twenty-one".