2213224021 has 4 divisors (see below), whose sum is σ = 2249506444. Its totient is φ = 2176941600.

The previous prime is 2213224007. The next prime is 2213224043. The reversal of 2213224021 is 1204223122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1204223122 = 2 ⋅602111561.

It can be written as a sum of positive squares in 2 ways, for example, as 135140625 + 2078083396 = 11625^2 + 45586^2 .

It is a cyclic number.

It is not a de Polignac number, because 2213224021 - 2⁷ = 2213223893 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 2213224021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2213224051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18141120 + ... + 18141241.

It is an arithmetic number, because the mean of its divisors is an integer number (562376611).

Almost surely, 2^2213224021 is an apocalyptic number.

It is an amenable number.

2213224021 is a deficient number, since it is larger than the sum of its proper divisors (36282423).

2213224021 is an equidigital number, since it uses as much as digits as its factorization.

2213224021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36282422.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 2213224021 is about 47044.9149324345. The cubic root of 2213224021 is about 1303.1921593560.

Adding to 2213224021 its reverse (1204223122), we get a palindrome (3417447143).

The spelling of 2213224021 in words is "two billion, two hundred thirteen million, two hundred twenty-four thousand, twenty-one".