8643012121 has 2 divisors, whose sum is σ = 8643012122. Its totient is φ = 8643012120.

The previous prime is 8643012097. The next prime is 8643012139. The reversal of 8643012121 is 1212103468.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5435375625 + 3207636496 = 73725^2 + 56636^2 .

It is a cyclic number.

It is not a de Polignac number, because 8643012121 - 2⁹ = 8643011609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8643012121.

It is not a weakly prime, because it can be changed into another prime (8643012821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4321506060 + 4321506061.

It is an arithmetic number, because the mean of its divisors is an integer number (4321506061).

Almost surely, 2^8643012121 is an apocalyptic number.

It is an amenable number.

8643012121 is a deficient number, since it is larger than the sum of its proper divisors (1).

8643012121 is an equidigital number, since it uses as much as digits as its factorization.

8643012121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 8643012121 is about 92967.8015282711. The cubic root of 8643012121 is about 2052.2095645317.

Adding to 8643012121 its reverse (1212103468), we get a palindrome (9855115589).

The spelling of 8643012121 in words is "eight billion, six hundred forty-three million, twelve thousand, one hundred twenty-one".