6908241721 has 2 divisors, whose sum is σ = 6908241722. Its totient is φ = 6908241720.

The previous prime is 6908241719. The next prime is 6908241727. The reversal of 6908241721 is 1271428096.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5769921600 + 1138320121 = 75960^2 + 33739^2 .

It is a cyclic number.

It is not a de Polignac number, because 6908241721 - 2¹ = 6908241719 is a prime.

Together with 6908241719, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6908241727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3454120860 + 3454120861.

It is an arithmetic number, because the mean of its divisors is an integer number (3454120861).

Almost surely, 2^6908241721 is an apocalyptic number.

It is an amenable number.

6908241721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6908241721 is an equidigital number, since it uses as much as digits as its factorization.

6908241721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 6908241721 is about 83115.8331547004. The cubic root of 6908241721 is about 1904.5359511553.

The spelling of 6908241721 in words is "six billion, nine hundred eight million, two hundred forty-one thousand, seven hundred twenty-one".