2292821 has 4 divisors (see below), whose sum is σ = 2296044. Its totient is φ = 2289600.

The previous prime is 2292809. The next prime is 2292859. The reversal of 2292821 is 1282922.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1473796 + 819025 = 1214^2 + 905^2 .

It is a cyclic number.

It is not a de Polignac number, because 2292821 - 2¹⁰ = 2291797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2292881) 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, 20 + ... + 2141.

It is an arithmetic number, because the mean of its divisors is an integer number (574011).

2^2292821 is an apocalyptic number.

It is an amenable number.

2292821 is a deficient number, since it is larger than the sum of its proper divisors (3223).

2292821 is a wasteful number, since it uses less digits than its factorization.

2292821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222.

The product of its digits is 1152, while the sum is 26.

The square root of 2292821 is about 1514.2063928012. The cubic root of 2292821 is about 131.8631310118.

It can be divided in two parts, 2292 and 821, that added together give a palindrome (3113).

The spelling of 2292821 in words is "two million, two hundred ninety-two thousand, eight hundred twenty-one".