2198321 has 4 divisors (see below), whose sum is σ = 2327652. Its totient is φ = 2068992.

The previous prime is 2198309. The next prime is 2198327. The reversal of 2198321 is 1238912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1597696 + 600625 = 1264^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 2198321 - 2¹⁴ = 2181937 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2198327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64640 + ... + 64673.

It is an arithmetic number, because the mean of its divisors is an integer number (581913).

2^2198321 is an apocalyptic number.

It is an amenable number.

2198321 is a deficient number, since it is larger than the sum of its proper divisors (129331).

2198321 is a wasteful number, since it uses less digits than its factorization.

2198321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129330.

The product of its digits is 864, while the sum is 26.

The square root of 2198321 is about 1482.6735986049. The cubic root of 2198321 is about 130.0260500065.

The spelling of 2198321 in words is "two million, one hundred ninety-eight thousand, three hundred twenty-one".