221048664601 has 2 divisors, whose sum is σ = 221048664602. Its totient is φ = 221048664600.

The previous prime is 221048664593. The next prime is 221048664637. The reversal of 221048664601 is 106466840122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 150738839001 + 70309825600 = 388251^2 + 265160^2 .

It is a cyclic number.

It is not a de Polignac number, because 221048664601 - 2³ = 221048664593 is a prime.

It is not a weakly prime, because it can be changed into another prime (221048664691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110524332300 + 110524332301.

It is an arithmetic number, because the mean of its divisors is an integer number (110524332301).

Almost surely, 2^221048664601 is an apocalyptic number.

It is an amenable number.

221048664601 is a deficient number, since it is larger than the sum of its proper divisors (1).

221048664601 is an equidigital number, since it uses as much as digits as its factorization.

221048664601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 110592, while the sum is 40.

The spelling of 221048664601 in words is "two hundred twenty-one billion, forty-eight million, six hundred sixty-four thousand, six hundred one".