2282821 has 4 divisors (see below), whose sum is σ = 2286144. Its totient is φ = 2279500.

The previous prime is 2282807. The next prime is 2282849. The reversal of 2282821 is 1282822.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1282822 = 2 ⋅641411.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2282821 is a prime.

It is a super-2 number, since 2×2282821² = 10422543436082, which contains 22 as substring.

It is a Duffinian number.

2282821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2282801) 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, 205 + ... + 2146.

It is an arithmetic number, because the mean of its divisors is an integer number (571536).

2^2282821 is an apocalyptic number.

It is an amenable number.

2282821 is a deficient number, since it is larger than the sum of its proper divisors (3323).

2282821 is an equidigital number, since it uses as much as digits as its factorization.

2282821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3322.

The product of its digits is 1024, while the sum is 25.

The square root of 2282821 is about 1510.9007247334. The cubic root of 2282821 is about 131.6711472776.

Subtracting from 2282821 its reverse (1282822), we obtain a palindrome (999999).

The spelling of 2282821 in words is "two million, two hundred eighty-two thousand, eight hundred twenty-one".