73224521 has 2 divisors, whose sum is σ = 73224522. Its totient is φ = 73224520.

The previous prime is 73224467. The next prime is 73224523. The reversal of 73224521 is 12542237.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 1990921 = 8440^2 + 1411^2 .

It is an emirp because it is prime and its reverse (12542237) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 73224521 - 2¹⁰ = 73223497 is a prime.

Together with 73224523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (73224523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36612260 + 36612261.

It is an arithmetic number, because the mean of its divisors is an integer number (36612261).

Almost surely, 2^73224521 is an apocalyptic number.

It is an amenable number.

73224521 is a deficient number, since it is larger than the sum of its proper divisors (1).

73224521 is an equidigital number, since it uses as much as digits as its factorization.

73224521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3360, while the sum is 26.

The square root of 73224521 is about 8557.1327557775. The cubic root of 73224521 is about 418.3619511682.

Adding to 73224521 its reverse (12542237), we get a palindrome (85766758).

The spelling of 73224521 in words is "seventy-three million, two hundred twenty-four thousand, five hundred twenty-one".