2291321 has 4 divisors (see below), whose sum is σ = 2308944. Its totient is φ = 2273700.

The previous prime is 2291287. The next prime is 2291327. The reversal of 2291321 is 1231922.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2291321 - 2⁶ = 2291257 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2291293 and 2291302.

It is not an unprimeable number, because it can be changed into a prime (2291327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8615 + ... + 8876.

It is an arithmetic number, because the mean of its divisors is an integer number (577236).

2^2291321 is an apocalyptic number.

It is an amenable number.

2291321 is a deficient number, since it is larger than the sum of its proper divisors (17623).

2291321 is a wasteful number, since it uses less digits than its factorization.

2291321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17622.

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

The square root of 2291321 is about 1513.7110028007. The cubic root of 2291321 is about 131.8343690855.

The spelling of 2291321 in words is "two million, two hundred ninety-one thousand, three hundred twenty-one".