4111666021721 has 2 divisors, whose sum is σ = 4111666021722. Its totient is φ = 4111666021720.

The previous prime is 4111666021681. The next prime is 4111666021733. The reversal of 4111666021721 is 1271206661114.

4111666021721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3541882596121 + 569783425600 = 1881989^2 + 754840^2 .

It is a cyclic number.

It is not a de Polignac number, because 4111666021721 - 2⁶ = 4111666021657 is a prime.

It is not a weakly prime, because it can be changed into another prime (4111666021921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2055833010860 + 2055833010861.

It is an arithmetic number, because the mean of its divisors is an integer number (2055833010861).

Almost surely, 2^{4111666021721} is an apocalyptic number.

It is an amenable number.

4111666021721 is a deficient number, since it is larger than the sum of its proper divisors (1).

4111666021721 is an equidigital number, since it uses as much as digits as its factorization.

4111666021721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 38.

The spelling of 4111666021721 in words is "four trillion, one hundred eleven billion, six hundred sixty-six million, twenty-one thousand, seven hundred twenty-one".