2120321 has 4 divisors (see below), whose sum is σ = 2423232. Its totient is φ = 1817412.

The previous prime is 2120317. The next prime is 2120329. The reversal of 2120321 is 1230212.

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 a cyclic number.

It is not a de Polignac number, because 2120321 - 2² = 2120317 is a prime.

It is a super-2 number, since 2×2120321² = 8991522286082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2120329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151445 + ... + 151458.

It is an arithmetic number, because the mean of its divisors is an integer number (605808).

2^2120321 is an apocalyptic number.

It is an amenable number.

2120321 is a deficient number, since it is larger than the sum of its proper divisors (302911).

2120321 is an equidigital number, since it uses as much as digits as its factorization.

2120321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302910.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 2120321 is about 1456.1322055363. The cubic root of 2120321 is about 128.4696491982.

Adding to 2120321 its reverse (1230212), we get a palindrome (3350533).

The spelling of 2120321 in words is "two million, one hundred twenty thousand, three hundred twenty-one".