7243743627721 has 2 divisors, whose sum is σ = 7243743627722. Its totient is φ = 7243743627720.

The previous prime is 7243743627707. The next prime is 7243743627817. The reversal of 7243743627721 is 1277263473427.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6943040551225 + 300703076496 = 2634965^2 + 548364^2 .

It is a cyclic number.

It is not a de Polignac number, because 7243743627721 - 2¹³ = 7243743619529 is a prime.

It is not a weakly prime, because it can be changed into another prime (7243743627121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3621871813860 + 3621871813861.

It is an arithmetic number, because the mean of its divisors is an integer number (3621871813861).

Almost surely, 2^{7243743627721} is an apocalyptic number.

It is an amenable number.

7243743627721 is a deficient number, since it is larger than the sum of its proper divisors (1).

7243743627721 is an equidigital number, since it uses as much as digits as its factorization.

7243743627721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16595712, while the sum is 55.

The spelling of 7243743627721 in words is "seven trillion, two hundred forty-three billion, seven hundred forty-three million, six hundred twenty-seven thousand, seven hundred twenty-one".