6821873173 has 2 divisors, whose sum is σ = 6821873174. Its totient is φ = 6821873172.

The previous prime is 6821873147. The next prime is 6821873213. The reversal of 6821873173 is 3713781286.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5867866404 + 954006769 = 76602^2 + 30887^2 .

It is a cyclic number.

It is not a de Polignac number, because 6821873173 - 2¹³ = 6821864981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6821873873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3410936586 + 3410936587.

It is an arithmetic number, because the mean of its divisors is an integer number (3410936587).

Almost surely, 2^6821873173 is an apocalyptic number.

It is an amenable number.

6821873173 is a deficient number, since it is larger than the sum of its proper divisors (1).

6821873173 is an equidigital number, since it uses as much as digits as its factorization.

6821873173 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 46.

The square root of 6821873173 is about 82594.6316233688. The cubic root of 6821873173 is about 1896.5656494325.

The spelling of 6821873173 in words is "six billion, eight hundred twenty-one million, eight hundred seventy-three thousand, one hundred seventy-three".