221323216117 has 2 divisors, whose sum is σ = 221323216118.
Its totient is φ = 221323216116.
The previous prime is 221323216111. The next prime is 221323216129. The reversal of 221323216117 is 711612323122.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 164542998321 + 56780217796 = 405639^2 + 238286^2
It is a cyclic number.
It is not a de Polignac number, because 221323216117 - 27 = 221323215989 is a prime.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (221323216111) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110661608058 + 110661608059.
It is an arithmetic number, because the mean of its divisors is an integer number (110661608059).
Almost surely, 2221323216117 is an apocalyptic number.
It is an amenable number.
221323216117 is a deficient number, since it is larger than the sum of its proper divisors (1).
221323216117 is an equidigital number, since it uses as much as digits as its factorization.
221323216117 is an evil number, because the sum of its binary digits is even.
The product of its digits is 6048, while the sum is 31.
Adding to 221323216117 its reverse (711612323122), we get a palindrome (932935539239).
The spelling of 221323216117 in words is "two hundred twenty-one billion, three hundred twenty-three million, two hundred sixteen thousand, one hundred seventeen".