221830117 has 2 divisors, whose sum is σ = 221830118. Its totient is φ = 221830116.

The previous prime is 221830109. The next prime is 221830201. The reversal of 221830117 is 711038122.

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., 180472356 + 41357761 = 13434^2 + 6431^2 .

It is a cyclic number.

It is not a de Polignac number, because 221830117 - 2³ = 221830109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221830091 and 221830100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221830417) 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, 110915058 + 110915059.

It is an arithmetic number, because the mean of its divisors is an integer number (110915059).

Almost surely, 2^221830117 is an apocalyptic number.

It is an amenable number.

221830117 is a deficient number, since it is larger than the sum of its proper divisors (1).

221830117 is an equidigital number, since it uses as much as digits as its factorization.

221830117 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 221830117 is about 14893.9624344900. The cubic root of 221830117 is about 605.3504033029.

Adding to 221830117 its reverse (711038122), we get a palindrome (932868239).

The spelling of 221830117 in words is "two hundred twenty-one million, eight hundred thirty thousand, one hundred seventeen".