6538314221 has 2 divisors, whose sum is σ = 6538314222. Its totient is φ = 6538314220.

The previous prime is 6538314187. The next prime is 6538314229. The reversal of 6538314221 is 1224138356.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6309124900 + 229189321 = 79430^2 + 15139^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6538314221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6538314229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3269157110 + 3269157111.

It is an arithmetic number, because the mean of its divisors is an integer number (3269157111).

Almost surely, 2^6538314221 is an apocalyptic number.

It is an amenable number.

6538314221 is a deficient number, since it is larger than the sum of its proper divisors (1).

6538314221 is an equidigital number, since it uses as much as digits as its factorization.

6538314221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 35.

The square root of 6538314221 is about 80859.8430681139. The cubic root of 6538314221 is about 1869.9152755041.

The spelling of 6538314221 in words is "six billion, five hundred thirty-eight million, three hundred fourteen thousand, two hundred twenty-one".