8417724821 has 4 divisors (see below), whose sum is σ = 9182972544. Its totient is φ = 7652477100.

The previous prime is 8417724787. The next prime is 8417724853. The reversal of 8417724821 is 1284277148.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8417724821 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 (8417724881) 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 in 3 ways as a sum of consecutive naturals, for example, 382623845 + ... + 382623866.

It is an arithmetic number, because the mean of its divisors is an integer number (2295743136).

Almost surely, 2^8417724821 is an apocalyptic number.

It is an amenable number.

8417724821 is a deficient number, since it is larger than the sum of its proper divisors (765247723).

8417724821 is a wasteful number, since it uses less digits than its factorization.

8417724821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765247722.

The product of its digits is 200704, while the sum is 44.

The square root of 8417724821 is about 91748.1597690112. The cubic root of 8417724821 is about 2034.2215062388.

The spelling of 8417724821 in words is "eight billion, four hundred seventeen million, seven hundred twenty-four thousand, eight hundred twenty-one".