847000807721 has 2 divisors, whose sum is σ = 847000807722. Its totient is φ = 847000807720.

The previous prime is 847000807637. The next prime is 847000807769. The reversal of 847000807721 is 127708000748.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844413966400 + 2586841321 = 918920^2 + 50861^2 .

It is a cyclic number.

It is not a de Polignac number, because 847000807721 - 2³⁴ = 829820938537 is a prime.

It is not a weakly prime, because it can be changed into another prime (847000807021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 423500403860 + 423500403861.

It is an arithmetic number, because the mean of its divisors is an integer number (423500403861).

Almost surely, 2^847000807721 is an apocalyptic number.

It is an amenable number.

847000807721 is a deficient number, since it is larger than the sum of its proper divisors (1).

847000807721 is an equidigital number, since it uses as much as digits as its factorization.

847000807721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 175616, while the sum is 44.

The spelling of 847000807721 in words is "eight hundred forty-seven billion, eight hundred seven thousand, seven hundred twenty-one".