2193221 has 6 divisors (see below), whose sum is σ = 2330130. Its totient is φ = 2063936.

The previous prime is 2193209. The next prime is 2193223. The reversal of 2193221 is 1223912.

2193221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 261121 + 1932100 = 511^2 + 1390^2 .

It is a de Polignac number, because none of the positive numbers 2^k-2193221 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 2193193 and 2193202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193223) 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 in 5 ways as a sum of consecutive naturals, for example, 3506 + ... + 4083.

It is an arithmetic number, because the mean of its divisors is an integer number (388355).

2^2193221 is an apocalyptic number.

It is an amenable number.

2193221 is a deficient number, since it is larger than the sum of its proper divisors (136909).

2193221 is an equidigital number, since it uses as much as digits as its factorization.

2193221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7623 (or 7606 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 2193221 is about 1480.9527338845. The cubic root of 2193221 is about 129.9254207339.

The spelling of 2193221 in words is "two million, one hundred ninety-three thousand, two hundred twenty-one".