2251321 has 4 divisors (see below), whose sum is σ = 2267892. Its totient is φ = 2234752.

The previous prime is 2251297. The next prime is 2251331. The reversal of 2251321 is 1231522.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231522 = 2 ⋅615761.

It can be written as a sum of positive squares in 2 ways, for example, as 1904400 + 346921 = 1380^2 + 589^2 .

It is a cyclic number.

It is not a de Polignac number, because 2251321 - 2¹⁷ = 2120249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2251295 and 2251304.

It is not an unprimeable number, because it can be changed into a prime (2251331) 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, 8080 + ... + 8353.

It is an arithmetic number, because the mean of its divisors is an integer number (566973).

2^2251321 is an apocalyptic number.

It is an amenable number.

2251321 is a deficient number, since it is larger than the sum of its proper divisors (16571).

2251321 is a wasteful number, since it uses less digits than its factorization.

2251321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16570.

The product of its digits is 120, while the sum is 16.

The square root of 2251321 is about 1500.4402687212. The cubic root of 2251321 is about 131.0627091332.

Adding to 2251321 its reverse (1231522), we get a palindrome (3482843).

The spelling of 2251321 in words is "two million, two hundred fifty-one thousand, three hundred twenty-one".