73310221 has 2 divisors, whose sum is σ = 73310222. Its totient is φ = 73310220.

The previous prime is 73310213. The next prime is 73310233. The reversal of 73310221 is 12201337.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65124900 + 8185321 = 8070^2 + 2861^2 .

It is an emirp because it is prime and its reverse (12201337) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73310221 - 2³ = 73310213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73310921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36655110 + 36655111.

It is an arithmetic number, because the mean of its divisors is an integer number (36655111).

Almost surely, 2^73310221 is an apocalyptic number.

It is an amenable number.

73310221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73310221 is an equidigital number, since it uses as much as digits as its factorization.

73310221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 73310221 is about 8562.1388099002. The cubic root of 73310221 is about 418.5251007090.

Adding to 73310221 its reverse (12201337), we get a palindrome (85511558).

The spelling of 73310221 in words is "seventy-three million, three hundred ten thousand, two hundred twenty-one".