2123023221 has 24 divisors (see below), whose sum is σ = 3352021920. Its totient is φ = 1284122400.

The previous prime is 2123023187. The next prime is 2123023247. The reversal of 2123023221 is 1223203212.

It is not a de Polignac number, because 2123023221 - 2⁷ = 2123023093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2123023194 and 2123023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123025221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29326 + ... + 71456.

It is an arithmetic number, because the mean of its divisors is an integer number (139667580).

Almost surely, 2^2123023221 is an apocalyptic number.

It is an amenable number.

2123023221 is a deficient number, since it is larger than the sum of its proper divisors (1228998699).

2123023221 is a wasteful number, since it uses less digits than its factorization.

2123023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42657 (or 42654 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 2123023221 is about 46076.2761190615. The cubic root of 2123023221 is about 1285.2420163194.

Adding to 2123023221 its reverse (1223203212), we get a palindrome (3346226433).

Subtracting from 2123023221 its reverse (1223203212), we obtain a square (899820009 = 29997²).

The spelling of 2123023221 in words is "two billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty-one".