222218547721 has 2 divisors, whose sum is σ = 222218547722. Its totient is φ = 222218547720.

The previous prime is 222218547623. The next prime is 222218547737. The reversal of 222218547721 is 127745812222.

222218547721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139640479225 + 82578068496 = 373685^2 + 287364^2 .

It is a cyclic number.

It is not a de Polignac number, because 222218547721 - 2¹⁵ = 222218514953 is a prime.

It is not a weakly prime, because it can be changed into another prime (222218527721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111109273860 + 111109273861.

It is an arithmetic number, because the mean of its divisors is an integer number (111109273861).

Almost surely, 2^222218547721 is an apocalyptic number.

It is an amenable number.

222218547721 is a deficient number, since it is larger than the sum of its proper divisors (1).

222218547721 is an equidigital number, since it uses as much as digits as its factorization.

222218547721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 250880, while the sum is 43.

The spelling of 222218547721 in words is "two hundred twenty-two billion, two hundred eighteen million, five hundred forty-seven thousand, seven hundred twenty-one".