2223121 has 4 divisors (see below), whose sum is σ = 2230452. Its totient is φ = 2215792.

The previous prime is 2223119. The next prime is 2223149. The reversal of 2223121 is 1213222.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 923521 + 1299600 = 961^2 + 1140^2 .

It is a cyclic number.

It is not a de Polignac number, because 2223121 - 2¹ = 2223119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2223101) 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, 3190 + ... + 3823.

It is an arithmetic number, because the mean of its divisors is an integer number (557613).

2^2223121 is an apocalyptic number.

It is an amenable number.

2223121 is a deficient number, since it is larger than the sum of its proper divisors (7331).

2223121 is an equidigital number, since it uses as much as digits as its factorization.

2223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7330.

The product of its digits is 48, while the sum is 13.

The square root of 2223121 is about 1491.0134137559. The cubic root of 2223121 is about 130.5131786479.

Adding to 2223121 its reverse (1213222), we get a palindrome (3436343).

The spelling of 2223121 in words is "two million, two hundred twenty-three thousand, one hundred twenty-one".