8421001247 has 4 divisors (see below), whose sum is σ = 8787131760. Its totient is φ = 8054870736.

The previous prime is 8421001241. The next prime is 8421001291. The reversal of 8421001247 is 7421001248.

8421001247 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 8421001247 - 2¹⁰ = 8421000223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8421001241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183065222 + ... + 183065267.

It is an arithmetic number, because the mean of its divisors is an integer number (2196782940).

Almost surely, 2^8421001247 is an apocalyptic number.

8421001247 is a deficient number, since it is larger than the sum of its proper divisors (366130513).

8421001247 is a wasteful number, since it uses less digits than its factorization.

8421001247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366130512.

The product of its (nonzero) digits is 3584, while the sum is 29.

The square root of 8421001247 is about 91766.0135725640. The cubic root of 8421001247 is about 2034.4853982772.

Subtracting from 8421001247 its reverse (7421001248), we obtain a palindrome (999999999).

It can be divided in two parts, 8421001 and 247, that added together give a palindrome (8421248).

The spelling of 8421001247 in words is "eight billion, four hundred twenty-one million, one thousand, two hundred forty-seven".