2231321 has 6 divisors (see below), whose sum is σ = 2273322. Its totient is φ = 2190080.

The previous prime is 2231311. The next prime is 2231329. The reversal of 2231321 is 1231322.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2175625 + 55696 = 1475^2 + 236^2 .

It is not a de Polignac number, because 2231321 - 2¹⁴ = 2214937 is a prime.

It is a super-3 number, since 3×2231321³ = 33327858837988467483, which contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2231296 and 2231305.

It is not an unprimeable number, because it can be changed into a prime (2231329) 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 5 ways as a sum of consecutive naturals, for example, 3161 + ... + 3801.

It is an arithmetic number, because the mean of its divisors is an integer number (378887).

2^2231321 is an apocalyptic number.

It is an amenable number.

2231321 is a deficient number, since it is larger than the sum of its proper divisors (42001).

2231321 is an frugal number, since it uses more digits than its factorization.

2231321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 700 counting only the distinct ones).

The product of its digits is 72, while the sum is 14.

The square root of 2231321 is about 1493.7606903383. The cubic root of 2231321 is about 130.6734480665.

Adding to 2231321 its reverse (1231322), we get a palindrome (3462643).

Subtracting from 2231321 its reverse (1231322), we obtain a palindrome (999999).

It can be divided in two parts, 2231 and 321, that added together give a palindrome (2552).

The spelling of 2231321 in words is "two million, two hundred thirty-one thousand, three hundred twenty-one".