2122122212221 has 12 divisors (see below), whose sum is σ = 2332630288800. Its totient is φ = 1929160926440.

The previous prime is 2122122212213. The next prime is 2122122212279. The reversal of 2122122212221 is 1222122212212.

It is not a de Polignac number, because 2122122212221 - 2³ = 2122122212213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2122122212192 and 2122122212201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2122122212521) 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, 6505350 + ... + 6823768.

It is an arithmetic number, because the mean of its divisors is an integer number (194385857400).

Almost surely, 2^{2122122212221} is an apocalyptic number.

It is an amenable number.

2122122212221 is a deficient number, since it is larger than the sum of its proper divisors (210508076579).

2122122212221 is a wasteful number, since it uses less digits than its factorization.

2122122212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 373520 (or 373509 counting only the distinct ones).

The product of its digits is 512, while the sum is 22.

Adding to 2122122212221 its reverse (1222122212212), we get a palindrome (3344244424433).

Subtracting from 2122122212221 its reverse (1222122212212), we obtain a palindrome (900000000009).

The spelling of 2122122212221 in words is "two trillion, one hundred twenty-two billion, one hundred twenty-two million, two hundred twelve thousand, two hundred twenty-one".