8421387047 has 2 divisors, whose sum is σ = 8421387048. Its totient is φ = 8421387046.

The previous prime is 8421387001. The next prime is 8421387077. The reversal of 8421387047 is 7407831248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8421387047 - 2¹² = 8421382951 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8421386989 and 8421387007.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8421387077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4210693523 + 4210693524.

It is an arithmetic number, because the mean of its divisors is an integer number (4210693524).

Almost surely, 2^8421387047 is an apocalyptic number.

8421387047 is a deficient number, since it is larger than the sum of its proper divisors (1).

8421387047 is an equidigital number, since it uses as much as digits as its factorization.

8421387047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 301056, while the sum is 44.

The square root of 8421387047 is about 91768.1156339172. The cubic root of 8421387047 is about 2034.5164671274.

The spelling of 8421387047 in words is "eight billion, four hundred twenty-one million, three hundred eighty-seven thousand, forty-seven".