8506779021 has 24 divisors (see below), whose sum is σ = 13245095136. Its totient is φ = 5230064160.

The previous prime is 8506779007. The next prime is 8506779059. The reversal of 8506779021 is 1209776058.

It is not a de Polignac number, because 8506779021 - 2⁷ = 8506778893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8506779091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94326 + ... + 160968.

It is an arithmetic number, because the mean of its divisors is an integer number (551878964).

Almost surely, 2^8506779021 is an apocalyptic number.

It is an amenable number.

8506779021 is a deficient number, since it is larger than the sum of its proper divisors (4738316115).

8506779021 is a wasteful number, since it uses less digits than its factorization.

8506779021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67753 (or 67750 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 8506779021 is about 92232.2016488818. The cubic root of 8506779021 is about 2041.3699484705.

The spelling of 8506779021 in words is "eight billion, five hundred six million, seven hundred seventy-nine thousand, twenty-one".