221443614217 has 6 divisors (see below), whose sum is σ = 257597673738. Its totient is φ = 189808812144.

The previous prime is 221443614187. The next prime is 221443614229. The reversal of 221443614217 is 712416344122.

It can be written as a sum of positive squares in only one way, i.e., 199933285321 + 21510328896 = 447139^2 + 146664^2 .

It is not a de Polignac number, because 221443614217 - 2³¹ = 219296130569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221443614247) 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 in 5 ways as a sum of consecutive naturals, for example, 2259628668 + ... + 2259628765.

It is an arithmetic number, because the mean of its divisors is an integer number (42932945623).

Almost surely, 2^221443614217 is an apocalyptic number.

It is an amenable number.

221443614217 is a deficient number, since it is larger than the sum of its proper divisors (36154059521).

221443614217 is an equidigital number, since it uses as much as digits as its factorization.

221443614217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4519257447 (or 4519257440 counting only the distinct ones).

The product of its digits is 64512, while the sum is 37.

Adding to 221443614217 its reverse (712416344122), we get a palindrome (933859958339).

The spelling of 221443614217 in words is "two hundred twenty-one billion, four hundred forty-three million, six hundred fourteen thousand, two hundred seventeen".