2122223121 has 12 divisors (see below), whose sum is σ = 3067181572. Its totient is φ = 1414008576.

The previous prime is 2122223053. The next prime is 2122223167. The reversal of 2122223121 is 1213222212.

It can be written as a sum of positive squares in 2 ways, for example, as 354945600 + 1767277521 = 18840^2 + 42039^2 .

It is not a de Polignac number, because 2122223121 - 2¹⁵ = 2122190353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122223094 and 2122223103.

It is not an unprimeable number, because it can be changed into a prime (2122223321) 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, 50356 + ... + 82341.

Almost surely, 2^2122223121 is an apocalyptic number.

It is an amenable number.

2122223121 is a deficient number, since it is larger than the sum of its proper divisors (944958451).

2122223121 is a wasteful number, since it uses less digits than its factorization.

2122223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134480 (or 134477 counting only the distinct ones).

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

The square root of 2122223121 is about 46067.5929586081. The cubic root of 2122223121 is about 1285.0805404055.

Adding to 2122223121 its reverse (1213222212), we get a palindrome (3335445333).

Subtracting from 2122223121 its reverse (1213222212), we obtain a palindrome (909000909).

The spelling of 2122223121 in words is "two billion, one hundred twenty-two million, two hundred twenty-three thousand, one hundred twenty-one".