8364667021 has 2 divisors, whose sum is σ = 8364667022. Its totient is φ = 8364667020.

The previous prime is 8364667009. The next prime is 8364667037. The reversal of 8364667021 is 1207664638.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5425942921 + 2938724100 = 73661^2 + 54210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8364667021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8364667061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4182333510 + 4182333511.

It is an arithmetic number, because the mean of its divisors is an integer number (4182333511).

Almost surely, 2^8364667021 is an apocalyptic number.

It is an amenable number.

8364667021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8364667021 is an equidigital number, since it uses as much as digits as its factorization.

8364667021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 8364667021 is about 91458.5535693628. The cubic root of 8364667021 is about 2029.9385245929.

The spelling of 8364667021 in words is "eight billion, three hundred sixty-four million, six hundred sixty-seven thousand, twenty-one".