73317421 has 2 divisors, whose sum is σ = 73317422. Its totient is φ = 73317420.

The previous prime is 73317407. The next prime is 73317427. The reversal of 73317421 is 12471337.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71318025 + 1999396 = 8445^2 + 1414^2 .

It is an emirp because it is prime and its reverse (12471337) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73317421 - 2¹⁷ = 73186349 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73317421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73317427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36658710 + 36658711.

It is an arithmetic number, because the mean of its divisors is an integer number (36658711).

Almost surely, 2^73317421 is an apocalyptic number.

It is an amenable number.

73317421 is a deficient number, since it is larger than the sum of its proper divisors (1).

73317421 is an equidigital number, since it uses as much as digits as its factorization.

73317421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3528, while the sum is 28.

The square root of 73317421 is about 8562.5592552694. The cubic root of 73317421 is about 418.5388017639.

Adding to 73317421 its reverse (12471337), we get a palindrome (85788758).

The spelling of 73317421 in words is "seventy-three million, three hundred seventeen thousand, four hundred twenty-one".