2149321 has 4 divisors (see below), whose sum is σ = 2156544. Its totient is φ = 2142100.

The previous prime is 2149289. The next prime is 2149331. The reversal of 2149321 is 1239412.

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 2149321 - 2⁵ = 2149289 is a prime.

It is a super-2 number, since 2×2149321² = 9239161522082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2149292 and 2149301.

It is not an unprimeable number, because it can be changed into a prime (2149331) 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, 3145 + ... + 3766.

It is an arithmetic number, because the mean of its divisors is an integer number (539136).

2^2149321 is an apocalyptic number.

It is an amenable number.

2149321 is a deficient number, since it is larger than the sum of its proper divisors (7223).

2149321 is an equidigital number, since it uses as much as digits as its factorization.

2149321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7222.

The product of its digits is 432, while the sum is 22.

The square root of 2149321 is about 1466.0562744997. The cubic root of 2149321 is about 129.0526996586.

Subtracting from 2149321 its reverse (1239412), we obtain a palindrome (909909).

The spelling of 2149321 in words is "two million, one hundred forty-nine thousand, three hundred twenty-one".