8579921621 has 4 divisors (see below), whose sum is σ = 8789188044. Its totient is φ = 8370655200.

The previous prime is 8579921591. The next prime is 8579921627. The reversal of 8579921621 is 1261299758.

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 5211396100 + 3368525521 = 72190^2 + 58039^2 .

It is a cyclic number.

It is not a de Polignac number, because 8579921621 - 2²⁶ = 8512812757 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8579921621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8579921627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104633150 + ... + 104633231.

It is an arithmetic number, because the mean of its divisors is an integer number (2197297011).

Almost surely, 2^8579921621 is an apocalyptic number.

It is an amenable number.

8579921621 is a deficient number, since it is larger than the sum of its proper divisors (209266423).

8579921621 is a wasteful number, since it uses less digits than its factorization.

8579921621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209266422.

The product of its digits is 544320, while the sum is 50.

The square root of 8579921621 is about 92627.8663308186. The cubic root of 8579921621 is about 2047.2039311643.

The spelling of 8579921621 in words is "eight billion, five hundred seventy-nine million, nine hundred twenty-one thousand, six hundred twenty-one".