8266389021 has 24 divisors (see below), whose sum is σ = 13032190080. Its totient is φ = 5007484800.

The previous prime is 8266389011. The next prime is 8266389049. The reversal of 8266389021 is 1209836628.

8266389021 is a `hidden beast` number, since 8 + 2 + 6 + 638 + 9 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 8266389021 - 2⁹ = 8266388509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8266389011) 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 23 ways as a sum of consecutive naturals, for example, 194620 + ... + 233258.

It is an arithmetic number, because the mean of its divisors is an integer number (543007920).

Almost surely, 2^8266389021 is an apocalyptic number.

It is an amenable number.

8266389021 is a deficient number, since it is larger than the sum of its proper divisors (4765801059).

8266389021 is a wasteful number, since it uses less digits than its factorization.

8266389021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40817 (or 40814 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 8266389021 is about 90919.6844528180. The cubic root of 8266389021 is about 2021.9571448210.

The spelling of 8266389021 in words is "eight billion, two hundred sixty-six million, three hundred eighty-nine thousand, twenty-one".