2211222221121 has 16 divisors (see below), whose sum is σ = 3028287309248. Its totient is φ = 1434160728000.

The previous prime is 2211222220997. The next prime is 2211222221189. The reversal of 2211222221121 is 1211222221122.

It is a de Polignac number, because none of the positive numbers 2^k-2211222221121 is a prime.

It is a super-2 number, since 2×2211222221121² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2211222221191) 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, 93006 + ... + 2105016.

It is an arithmetic number, because the mean of its divisors is an integer number (189267956828).

Almost surely, 2^{2211222221121} is an apocalyptic number.

It is an amenable number.

2211222221121 is a deficient number, since it is larger than the sum of its proper divisors (817065088127).

2211222221121 is a wasteful number, since it uses less digits than its factorization.

2211222221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021952.

The product of its digits is 256, while the sum is 21.

Adding to 2211222221121 its reverse (1211222221122), we get a palindrome (3422444442243).

Subtracting from 2211222221121 its reverse (1211222221122), we obtain a palindrome (999999999999).

The spelling of 2211222221121 in words is "two trillion, two hundred eleven billion, two hundred twenty-two million, two hundred twenty-one thousand, one hundred twenty-one".