2224021 has 4 divisors (see below), whose sum is σ = 2249100. Its totient is φ = 2198944.

The previous prime is 2224009. The next prime is 2224037. The reversal of 2224021 is 1204222.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1204222 = 2 ⋅602111.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 688900 = 1239^2 + 830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2224021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2223992 and 2224010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2225021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12406 + ... + 12583.

It is an arithmetic number, because the mean of its divisors is an integer number (562275).

2^2224021 is an apocalyptic number.

It is an amenable number.

2224021 is a deficient number, since it is larger than the sum of its proper divisors (25079).

2224021 is an equidigital number, since it uses as much as digits as its factorization.

2224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25078.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 2224021 is about 1491.3151913663. The cubic root of 2224021 is about 130.5307884276.

Adding to 2224021 its reverse (1204222), we get a palindrome (3428243).

The spelling of 2224021 in words is "two million, two hundred twenty-four thousand, twenty-one".