8212171213 has 2 divisors, whose sum is σ = 8212171214. Its totient is φ = 8212171212.

The previous prime is 8212171199. The next prime is 8212171217. The reversal of 8212171213 is 3121712128.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4157283529 + 4054887684 = 64477^2 + 63678^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8212171213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8212171217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4106085606 + 4106085607.

It is an arithmetic number, because the mean of its divisors is an integer number (4106085607).

Almost surely, 2^8212171213 is an apocalyptic number.

It is an amenable number.

8212171213 is a deficient number, since it is larger than the sum of its proper divisors (1).

8212171213 is an equidigital number, since it uses as much as digits as its factorization.

8212171213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 28.

The square root of 8212171213 is about 90621.0307434207. The cubic root of 8212171213 is about 2017.5268898070.

The spelling of 8212171213 in words is "eight billion, two hundred twelve million, one hundred seventy-one thousand, two hundred thirteen".