2158321 has 8 divisors (see below), whose sum is σ = 2418624. Its totient is φ = 1908720.

The previous prime is 2158307. The next prime is 2158333. The reversal of 2158321 is 1238512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2158321 - 2¹⁵ = 2125553 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2158292 and 2158301.

It is not an unprimeable number, because it can be changed into a prime (2158301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2245 + ... + 3058.

It is an arithmetic number, because the mean of its divisors is an integer number (302328).

2^2158321 is an apocalyptic number.

It is an amenable number.

2158321 is a deficient number, since it is larger than the sum of its proper divisors (260303).

2158321 is a wasteful number, since it uses less digits than its factorization.

2158321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its digits is 480, while the sum is 22.

The square root of 2158321 is about 1469.1225272250. The cubic root of 2158321 is about 129.2325792398.

The spelling of 2158321 in words is "two million, one hundred fifty-eight thousand, three hundred twenty-one".