73214321 has 2 divisors, whose sum is σ = 73214322. Its totient is φ = 73214320.

The previous prime is 73214287. The next prime is 73214329. The reversal of 73214321 is 12341237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71639296 + 1575025 = 8464^2 + 1255^2 .

It is an emirp because it is prime and its reverse (12341237) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73214321 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (73214329) 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, 36607160 + 36607161.

It is an arithmetic number, because the mean of its divisors is an integer number (36607161).

Almost surely, 2^73214321 is an apocalyptic number.

It is an amenable number.

73214321 is a deficient number, since it is larger than the sum of its proper divisors (1).

73214321 is an equidigital number, since it uses as much as digits as its factorization.

73214321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 23.

The square root of 73214321 is about 8556.5367409952. The cubic root of 73214321 is about 418.3425246610.

Adding to 73214321 its reverse (12341237), we get a palindrome (85555558).

The spelling of 73214321 in words is "seventy-three million, two hundred fourteen thousand, three hundred twenty-one".