2139321 has 4 divisors (see below), whose sum is σ = 2852432. Its totient is φ = 1426212.

The previous prime is 2139311. The next prime is 2139323. The reversal of 2139321 is 1239312.

It is a happy number.

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 not a de Polignac number, because 2139321 - 2¹¹ = 2137273 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2139323) 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, 356551 + ... + 356556.

It is an arithmetic number, because the mean of its divisors is an integer number (713108).

2^2139321 is an apocalyptic number.

It is an amenable number.

2139321 is a deficient number, since it is larger than the sum of its proper divisors (713111).

2139321 is an equidigital number, since it uses as much as digits as its factorization.

2139321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713110.

The product of its digits is 324, while the sum is 21.

The square root of 2139321 is about 1462.6417879987. The cubic root of 2139321 is about 128.8522435401.

Subtracting from 2139321 its reverse (1239312), we obtain a palindrome (900009).

The spelling of 2139321 in words is "two million, one hundred thirty-nine thousand, three hundred twenty-one".