6896784821 has 2 divisors, whose sum is σ = 6896784822. Its totient is φ = 6896784820.

The previous prime is 6896784781. The next prime is 6896784883. The reversal of 6896784821 is 1284876986.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6858158596 + 38626225 = 82814^2 + 6215^2 .

It is a cyclic number.

It is not a de Polignac number, because 6896784821 - 2¹⁰ = 6896783797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6896784121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3448392410 + 3448392411.

It is an arithmetic number, because the mean of its divisors is an integer number (3448392411).

Almost surely, 2^6896784821 is an apocalyptic number.

It is an amenable number.

6896784821 is a deficient number, since it is larger than the sum of its proper divisors (1).

6896784821 is an equidigital number, since it uses as much as digits as its factorization.

6896784821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 59.

The square root of 6896784821 is about 83046.8832708368. The cubic root of 6896784821 is about 1903.4825161245.

The spelling of 6896784821 in words is "six billion, eight hundred ninety-six million, seven hundred eighty-four thousand, eight hundred twenty-one".