2643846221 has 2 divisors, whose sum is σ = 2643846222. Its totient is φ = 2643846220.

The previous prime is 2643846199. The next prime is 2643846229. The reversal of 2643846221 is 1226483462.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1510177321 + 1133668900 = 38861^2 + 33670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2643846221 - 2¹⁸ = 2643584077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2643846229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1321923110 + 1321923111.

It is an arithmetic number, because the mean of its divisors is an integer number (1321923111).

Almost surely, 2^2643846221 is an apocalyptic number.

It is an amenable number.

2643846221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2643846221 is an equidigital number, since it uses as much as digits as its factorization.

2643846221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 110592, while the sum is 38.

The square root of 2643846221 is about 51418.3451795174. The cubic root of 2643846221 is about 1382.7555075606.

The spelling of 2643846221 in words is "two billion, six hundred forty-three million, eight hundred forty-six thousand, two hundred twenty-one".