8467640021 has 2 divisors, whose sum is σ = 8467640022. Its totient is φ = 8467640020.

The previous prime is 8467640011. The next prime is 8467640059. The reversal of 8467640021 is 1200467648.

It is an a-pointer prime, because the next prime (8467640059) can be obtained adding 8467640021 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7728343921 + 739296100 = 87911^2 + 27190^2 .

It is a cyclic number.

It is not a de Polignac number, because 8467640021 - 2²⁶ = 8400531157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8467640011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4233820010 + 4233820011.

It is an arithmetic number, because the mean of its divisors is an integer number (4233820011).

Almost surely, 2^8467640021 is an apocalyptic number.

It is an amenable number.

8467640021 is a deficient number, since it is larger than the sum of its proper divisors (1).

8467640021 is an equidigital number, since it uses as much as digits as its factorization.

8467640021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 8467640021 is about 92019.7805963479. The cubic root of 8467640021 is about 2038.2344089257.

The spelling of 8467640021 in words is "eight billion, four hundred sixty-seven million, six hundred forty thousand, twenty-one".