2123222121 has 12 divisors (see below), whose sum is σ = 3096653248. Its totient is φ = 1401738264.

The previous prime is 2123222093. The next prime is 2123222141. The reversal of 2123222121 is 1212223212.

It is not a de Polignac number, because 2123222121 - 2⁷ = 2123221993 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2123222094 and 2123222103.

It is not an unprimeable number, because it can be changed into a prime (2123222141) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1144285 + ... + 1146138.

Almost surely, 2^2123222121 is an apocalyptic number.

It is an amenable number.

2123222121 is a deficient number, since it is larger than the sum of its proper divisors (973431127).

2123222121 is a wasteful number, since it uses less digits than its factorization.

2123222121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2290532 (or 2290529 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 2123222121 is about 46078.4344460616. The cubic root of 2123222121 is about 1285.2821519543.

Adding to 2123222121 its reverse (1212223212), we get a palindrome (3335445333).

The spelling of 2123222121 in words is "two billion, one hundred twenty-three million, two hundred twenty-two thousand, one hundred twenty-one".