8206366921 has 9 divisors (see below), whose sum is σ = 8273308149. Its totient is φ = 8139965184.

The previous prime is 8206366907. The next prime is 8206366967. The reversal of 8206366921 is 1296636028.

The square root of 8206366921 is 90589.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1809566521 + 6396800400 = 42539^2 + 79980^2 .

It is not a de Polignac number, because 8206366921 - 2⁹ = 8206366409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8206364921) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14222185 + ... + 14222761.

It is an arithmetic number, because the mean of its divisors is an integer number (919256461).

Almost surely, 2^8206366921 is an apocalyptic number.

8206366921 is the 90589-th square number.

8206366921 is the 45295-th centered octagonal number.

It is an amenable number.

8206366921 is a deficient number, since it is larger than the sum of its proper divisors (66941228).

8206366921 is an frugal number, since it uses more digits than its factorization.

8206366921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1468 (or 734 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The cubic root of 8206366921 is about 2017.0514542256.

The spelling of 8206366921 in words is "eight billion, two hundred six million, three hundred sixty-six thousand, nine hundred twenty-one".