221093893 has 2 divisors, whose sum is σ = 221093894. Its totient is φ = 221093892.

The previous prime is 221093867. The next prime is 221093897. The reversal of 221093893 is 398390122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 212051844 + 9042049 = 14562^2 + 3007^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221093893 is a prime.

It is equal to p_12179395 and since 221093893 and 12179395 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221093897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110546946 + 110546947.

It is an arithmetic number, because the mean of its divisors is an integer number (110546947).

Almost surely, 2^221093893 is an apocalyptic number.

It is an amenable number.

221093893 is a deficient number, since it is larger than the sum of its proper divisors (1).

221093893 is an equidigital number, since it uses as much as digits as its factorization.

221093893 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 37.

The square root of 221093893 is about 14869.2263753028. The cubic root of 221093893 is about 604.6799691651.

The spelling of 221093893 in words is "two hundred twenty-one million, ninety-three thousand, eight hundred ninety-three".