221048664593 has 2 divisors, whose sum is σ = 221048664594. Its totient is φ = 221048664592.

The previous prime is 221048664589. The next prime is 221048664601. The reversal of 221048664593 is 395466840122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129447404944 + 91601259649 = 359788^2 + 302657^2 .

It is a cyclic number.

It is not a de Polignac number, because 221048664593 - 2² = 221048664589 is a prime.

It is a super-2 number, since 2×221048664593² (a number of 23 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (221048664553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110524332296 + 110524332297.

It is an arithmetic number, because the mean of its divisors is an integer number (110524332297).

Almost surely, 2^221048664593 is an apocalyptic number.

It is an amenable number.

221048664593 is a deficient number, since it is larger than the sum of its proper divisors (1).

221048664593 is an equidigital number, since it uses as much as digits as its factorization.

221048664593 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 221048664593 in words is "two hundred twenty-one billion, forty-eight million, six hundred sixty-four thousand, five hundred ninety-three".