4538448221 has 2 divisors, whose sum is σ = 4538448222. Its totient is φ = 4538448220.

The previous prime is 4538448199. The next prime is 4538448223. The reversal of 4538448221 is 1228448354.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4474272100 + 64176121 = 66890^2 + 8011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4538448221 is a prime.

Together with 4538448223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4538448223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2269224110 + 2269224111.

It is an arithmetic number, because the mean of its divisors is an integer number (2269224111).

Almost surely, 2^4538448221 is an apocalyptic number.

It is an amenable number.

4538448221 is a deficient number, since it is larger than the sum of its proper divisors (1).

4538448221 is an equidigital number, since it uses as much as digits as its factorization.

4538448221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 245760, while the sum is 41.

The square root of 4538448221 is about 67368.0059152711. The cubic root of 4538448221 is about 1655.6522677896.

The spelling of 4538448221 in words is "four billion, five hundred thirty-eight million, four hundred forty-eight thousand, two hundred twenty-one".