6821873213 has 2 divisors, whose sum is σ = 6821873214. Its totient is φ = 6821873212.

The previous prime is 6821873173. The next prime is 6821873231. The reversal of 6821873213 is 3123781286.

Together with next prime (6821873231) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4275459769 + 2546413444 = 65387^2 + 50462^2 .

It is a cyclic number.

It is not a de Polignac number, because 6821873213 - 2¹⁶ = 6821807677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6821873263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410936606 + 3410936607.

It is an arithmetic number, because the mean of its divisors is an integer number (3410936607).

Almost surely, 2^6821873213 is an apocalyptic number.

It is an amenable number.

6821873213 is a deficient number, since it is larger than the sum of its proper divisors (1).

6821873213 is an equidigital number, since it uses as much as digits as its factorization.

6821873213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 41.

The square root of 6821873213 is about 82594.6318655153. The cubic root of 6821873213 is about 1896.5656531393.

The spelling of 6821873213 in words is "six billion, eight hundred twenty-one million, eight hundred seventy-three thousand, two hundred thirteen".