73221073 has 2 divisors, whose sum is σ = 73221074. Its totient is φ = 73221072.

The previous prime is 73221059. The next prime is 73221089. The reversal of 73221073 is 37012237.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46471489 + 26749584 = 6817^2 + 5172^2 .

It is an emirp because it is prime and its reverse (37012237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73221073 - 2¹⁷ = 73090001 is a prime.

It is a super-2 number, since 2×73221073² = 10722651062542658, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (73221053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36610536 + 36610537.

It is an arithmetic number, because the mean of its divisors is an integer number (36610537).

Almost surely, 2^73221073 is an apocalyptic number.

It is an amenable number.

73221073 is a deficient number, since it is larger than the sum of its proper divisors (1).

73221073 is an equidigital number, since it uses as much as digits as its factorization.

73221073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1764, while the sum is 25.

The square root of 73221073 is about 8556.9312840527. The cubic root of 73221073 is about 418.3553844488.

The spelling of 73221073 in words is "seventy-three million, two hundred twenty-one thousand, seventy-three".