2123232221 has 16 divisors (see below), whose sum is σ = 2456293248. Its totient is φ = 1813862400.

The previous prime is 2123232193. The next prime is 2123232227. The reversal of 2123232221 is 1222323212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2123232221 - 2¹⁰ = 2123231197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123232193 and 2123232202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123232227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117416 + ... + 134286.

It is an arithmetic number, because the mean of its divisors is an integer number (153518328).

Almost surely, 2^2123232221 is an apocalyptic number.

It is an amenable number.

2123232221 is a deficient number, since it is larger than the sum of its proper divisors (333061027).

2123232221 is a wasteful number, since it uses less digits than its factorization.

2123232221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17572.

The product of its digits is 576, while the sum is 20.

The square root of 2123232221 is about 46078.5440416687. The cubic root of 2123232221 is about 1285.2841899463.

Adding to 2123232221 its reverse (1222323212), we get a palindrome (3345555433).

Subtracting from 2123232221 its reverse (1222323212), we obtain a palindrome (900909009).

The spelling of 2123232221 in words is "two billion, one hundred twenty-three million, two hundred thirty-two thousand, two hundred twenty-one".