8358556021 has 4 divisors (see below), whose sum is σ = 8364156012. Its totient is φ = 8352956032.

The previous prime is 8358555977. The next prime is 8358556043. The reversal of 8358556021 is 1206558538.

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 4257562500 + 4100993521 = 65250^2 + 64039^2 .

It is a cyclic number.

It is not a de Polignac number, because 8358556021 - 2⁷ = 8358555893 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 (8358556051) 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, 2797756 + ... + 2800741.

It is an arithmetic number, because the mean of its divisors is an integer number (2091039003).

Almost surely, 2^8358556021 is an apocalyptic number.

It is an amenable number.

8358556021 is a deficient number, since it is larger than the sum of its proper divisors (5599991).

8358556021 is a wasteful number, since it uses less digits than its factorization.

8358556021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5599990.

The product of its (nonzero) digits is 288000, while the sum is 43.

The square root of 8358556021 is about 91425.1388896949. The cubic root of 8358556021 is about 2029.4440647247. Note that the first 3 decimals are identical.

The spelling of 8358556021 in words is "eight billion, three hundred fifty-eight million, five hundred fifty-six thousand, twenty-one".