8421419681 has 2 divisors, whose sum is σ = 8421419682. Its totient is φ = 8421419680.

The previous prime is 8421419653. The next prime is 8421419737. The reversal of 8421419681 is 1869141248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5009808400 + 3411611281 = 70780^2 + 58409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8421419681 is a prime.

It is a super-2 number, since 2×8421419681² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8421410681) 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, 4210709840 + 4210709841.

It is an arithmetic number, because the mean of its divisors is an integer number (4210709841).

Almost surely, 2^8421419681 is an apocalyptic number.

It is an amenable number.

8421419681 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421419681 is an equidigital number, since it uses as much as digits as its factorization.

8421419681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 44.

The square root of 8421419681 is about 91768.2934405996. The cubic root of 8421419681 is about 2034.5190951318.

The spelling of 8421419681 in words is "eight billion, four hundred twenty-one million, four hundred nineteen thousand, six hundred eighty-one".