2202821 has 4 divisors (see below), whose sum is σ = 2206944. Its totient is φ = 2198700.

The previous prime is 2202817. The next prime is 2202853. The reversal of 2202821 is 1282022.

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 2202821 - 2² = 2202817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2202821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2202121) 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, 1115 + ... + 2376.

It is an arithmetic number, because the mean of its divisors is an integer number (551736).

2^2202821 is an apocalyptic number.

It is an amenable number.

2202821 is a deficient number, since it is larger than the sum of its proper divisors (4123).

2202821 is an equidigital number, since it uses as much as digits as its factorization.

2202821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4122.

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 2202821 is about 1484.1903516733. The cubic root of 2202821 is about 130.1147113727.

Adding to 2202821 its reverse (1282022), we get a palindrome (3484843).

The spelling of 2202821 in words is "two million, two hundred two thousand, eight hundred twenty-one".