2123112221 has 8 divisors (see below), whose sum is σ = 2286887424. Its totient is φ = 1965292560.

The previous prime is 2123112203. The next prime is 2123112239. The reversal of 2123112221 is 1222113212.

It is an interprime number because it is at equal distance from previous prime (2123112203) and next prime (2123112239).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2123112221 - 2⁶ = 2123112157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2123112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123112241) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1488146 + ... + 1489571.

It is an arithmetic number, because the mean of its divisors is an integer number (285860928).

Almost surely, 2^2123112221 is an apocalyptic number.

It is an amenable number.

2123112221 is a deficient number, since it is larger than the sum of its proper divisors (163775203).

2123112221 is a wasteful number, since it uses less digits than its factorization.

2123112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2977771.

The product of its digits is 96, while the sum is 17.

The square root of 2123112221 is about 46077.2418987942. The cubic root of 2123112221 is about 1285.2599757620.

Adding to 2123112221 its reverse (1222113212), we get a palindrome (3345225433).

Subtracting from 2123112221 its reverse (1222113212), we obtain a palindrome (900999009).

The spelling of 2123112221 in words is "two billion, one hundred twenty-three million, one hundred twelve thousand, two hundred twenty-one".