8073716821 has 4 divisors (see below), whose sum is σ = 8087906700. Its totient is φ = 8059526944.

The previous prime is 8073716803. The next prime is 8073716837. The reversal of 8073716821 is 1286173708.

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 687173796 + 7386543025 = 26214^2 + 85945^2 .

It is a cyclic number.

It is not a de Polignac number, because 8073716821 - 2¹⁵ = 8073684053 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 (8073716801) 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, 7094086 + ... + 7095223.

It is an arithmetic number, because the mean of its divisors is an integer number (2021976675).

Almost surely, 2^8073716821 is an apocalyptic number.

It is an amenable number.

8073716821 is a deficient number, since it is larger than the sum of its proper divisors (14189879).

8073716821 is a wasteful number, since it uses less digits than its factorization.

8073716821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14189878.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 8073716821 is about 89853.8636954472. The cubic root of 8073716821 is about 2006.1242957753.

The spelling of 8073716821 in words is "eight billion, seventy-three million, seven hundred sixteen thousand, eight hundred twenty-one".