221066693 has 2 divisors, whose sum is σ = 221066694. Its totient is φ = 221066692.

The previous prime is 221066689. The next prime is 221066717. The reversal of 221066693 is 396660122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 195077089 + 25989604 = 13967^2 + 5098^2 .

It is a cyclic number.

It is not a de Polignac number, because 221066693 - 2² = 221066689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221066663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110533346 + 110533347.

It is an arithmetic number, because the mean of its divisors is an integer number (110533347).

Almost surely, 2^221066693 is an apocalyptic number.

It is an amenable number.

221066693 is a deficient number, since it is larger than the sum of its proper divisors (1).

221066693 is an equidigital number, since it uses as much as digits as its factorization.

221066693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 35.

The square root of 221066693 is about 14868.3117064447. The cubic root of 221066693 is about 604.6551712999.

The spelling of 221066693 in words is "two hundred twenty-one million, sixty-six thousand, six hundred ninety-three".