8369716406221 has 4 divisors (see below), whose sum is σ = 8371032198844. Its totient is φ = 8368400613600.

The previous prime is 8369716406173. The next prime is 8369716406239. The reversal of 8369716406221 is 1226046179638.

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

It can be written as a sum of positive squares in 2 ways, for example, as 821042580996 + 7548673825225 = 906114^2 + 2747485^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8369716406221 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 (8369716406251) 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, 657886770 + ... + 657899491.

It is an arithmetic number, because the mean of its divisors is an integer number (2092758049711).

Almost surely, 2^{8369716406221} is an apocalyptic number.

It is an amenable number.

8369716406221 is a deficient number, since it is larger than the sum of its proper divisors (1315792623).

8369716406221 is a wasteful number, since it uses less digits than its factorization.

8369716406221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1315792622.

The product of its (nonzero) digits is 5225472, while the sum is 55.

The spelling of 8369716406221 in words is "eight trillion, three hundred sixty-nine billion, seven hundred sixteen million, four hundred six thousand, two hundred twenty-one".