73226221 has 2 divisors, whose sum is σ = 73226222. Its totient is φ = 73226220.

The previous prime is 73226207. The next prime is 73226233. The reversal of 73226221 is 12262237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64160100 + 9066121 = 8010^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 73226221 - 2⁷ = 73226093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73226281) 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, 36613110 + 36613111.

It is an arithmetic number, because the mean of its divisors is an integer number (36613111).

Almost surely, 2^73226221 is an apocalyptic number.

It is an amenable number.

73226221 is a deficient number, since it is larger than the sum of its proper divisors (1).

73226221 is an equidigital number, since it uses as much as digits as its factorization.

73226221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2016, while the sum is 25.

The square root of 73226221 is about 8557.2320875386. The cubic root of 73226221 is about 418.3651887440.

Adding to 73226221 its reverse (12262237), we get a palindrome (85488458).

The spelling of 73226221 in words is "seventy-three million, two hundred twenty-six thousand, two hundred twenty-one".