68160221 has 2 divisors, whose sum is σ = 68160222. Its totient is φ = 68160220.

The previous prime is 68160193. The next prime is 68160223. The reversal of 68160221 is 12206186.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62805625 + 5354596 = 7925^2 + 2314^2 .

It is a cyclic number.

It is not a de Polignac number, because 68160221 - 2¹⁰ = 68159197 is a prime.

Together with 68160223, 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 (68160223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34080110 + 34080111.

It is an arithmetic number, because the mean of its divisors is an integer number (34080111).

Almost surely, 2^68160221 is an apocalyptic number.

It is an amenable number.

68160221 is a deficient number, since it is larger than the sum of its proper divisors (1).

68160221 is an equidigital number, since it uses as much as digits as its factorization.

68160221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 68160221 is about 8255.9203605655. The cubic root of 68160221 is about 408.4858307357.

The spelling of 68160221 in words is "sixty-eight million, one hundred sixty thousand, two hundred twenty-one".