2123121223 has 4 divisors (see below), whose sum is σ = 2163180168. Its totient is φ = 2083062280.

The previous prime is 2123121197. The next prime is 2123121241. The reversal of 2123121223 is 3221213212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123121223 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 2123121223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123121263) 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, 20029393 + ... + 20029498.

It is an arithmetic number, because the mean of its divisors is an integer number (540795042).

Almost surely, 2^2123121223 is an apocalyptic number.

2123121223 is a deficient number, since it is larger than the sum of its proper divisors (40058945).

2123121223 is an equidigital number, since it uses as much as digits as its factorization.

2123121223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40058944.

The product of its digits is 288, while the sum is 19.

The square root of 2123121223 is about 46077.3395824889. The cubic root of 2123121223 is about 1285.2617922611.

Adding to 2123121223 its reverse (3221213212), we get a palindrome (5344334435).

The spelling of 2123121223 in words is "two billion, one hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-three".