2121223 has 4 divisors (see below), whose sum is σ = 2284408. Its totient is φ = 1958040.

The previous prime is 2121199. The next prime is 2121239. The reversal of 2121223 is 3221212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121223 - 2⁵ = 2121191 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 163171 = 2121223 / (2 + 1 + 2 + 1 + 2 + 2 + 3).

It is a Duffinian number.

2121223 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121253) 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, 81573 + ... + 81598.

It is an arithmetic number, because the mean of its divisors is an integer number (571102).

2^2121223 is an apocalyptic number.

2121223 is a deficient number, since it is larger than the sum of its proper divisors (163185).

2121223 is a wasteful number, since it uses less digits than its factorization.

2121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163184.

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

The square root of 2121223 is about 1456.4418972276. The cubic root of 2121223 is about 128.4878639237.

Adding to 2121223 its reverse (3221212), we get a palindrome (5342435).

The spelling of 2121223 in words is "two million, one hundred twenty-one thousand, two hundred twenty-three".