8465188021 has 2 divisors, whose sum is σ = 8465188022. Its totient is φ = 8465188020.

The previous prime is 8465188003. The next prime is 8465188027. The reversal of 8465188021 is 1208815648.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8447631921 + 17556100 = 91911^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 8465188021 - 2⁵ = 8465187989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8465188027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4232594010 + 4232594011.

It is an arithmetic number, because the mean of its divisors is an integer number (4232594011).

Almost surely, 2^8465188021 is an apocalyptic number.

It is an amenable number.

8465188021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8465188021 is an equidigital number, since it uses as much as digits as its factorization.

8465188021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122880, while the sum is 43.

The square root of 8465188021 is about 92006.4564093194. The cubic root of 8465188021 is about 2038.0376507089.

The spelling of 8465188021 in words is "eight billion, four hundred sixty-five million, one hundred eighty-eight thousand, twenty-one".