221230073 has 2 divisors, whose sum is σ = 221230074. Its totient is φ = 221230072.

The previous prime is 221230069. The next prime is 221230127. The reversal of 221230073 is 370032122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120187369 + 101042704 = 10963^2 + 10052^2 .

It is a cyclic number.

It is not a de Polignac number, because 221230073 - 2² = 221230069 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221230013) 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, 110615036 + 110615037.

It is an arithmetic number, because the mean of its divisors is an integer number (110615037).

Almost surely, 2^221230073 is an apocalyptic number.

It is an amenable number.

221230073 is a deficient number, since it is larger than the sum of its proper divisors (1).

221230073 is an equidigital number, since it uses as much as digits as its factorization.

221230073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 221230073 is about 14873.8049267832. The cubic root of 221230073 is about 604.8040920228.

Adding to 221230073 its reverse (370032122), we get a palindrome (591262195).

The spelling of 221230073 in words is "two hundred twenty-one million, two hundred thirty thousand, seventy-three".