4221365624209 has 2 divisors, whose sum is σ = 4221365624210. Its totient is φ = 4221365624208.

The previous prime is 4221365624197. The next prime is 4221365624233. The reversal of 4221365624209 is 9024265631224.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2299529616400 + 1921836007809 = 1516420^2 + 1386303^2 .

It is a cyclic number.

It is not a de Polignac number, because 4221365624209 - 2⁹ = 4221365623697 is a prime.

It is not a weakly prime, because it can be changed into another prime (4221365624279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2110682812104 + 2110682812105.

It is an arithmetic number, because the mean of its divisors is an integer number (2110682812105).

Almost surely, 2^{4221365624209} is an apocalyptic number.

It is an amenable number.

4221365624209 is a deficient number, since it is larger than the sum of its proper divisors (1).

4221365624209 is an equidigital number, since it uses as much as digits as its factorization.

4221365624209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1244160, while the sum is 46.

The spelling of 4221365624209 in words is "four trillion, two hundred twenty-one billion, three hundred sixty-five million, six hundred twenty-four thousand, two hundred nine".