2211221121 has 48 divisors (see below), whose sum is σ = 3268742400. Its totient is φ = 1325201472.

The previous prime is 2211221113. The next prime is 2211221141. The reversal of 2211221121 is 1211221122.

It is not a de Polignac number, because 2211221121 - 2³ = 2211221113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2211221121.

It is not an unprimeable number, because it can be changed into a prime (2211221141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3355090 + ... + 3355748.

It is an arithmetic number, because the mean of its divisors is an integer number (68098800).

Almost surely, 2^2211221121 is an apocalyptic number.

It is an amenable number.

2211221121 is a deficient number, since it is larger than the sum of its proper divisors (1057521279).

2211221121 is a wasteful number, since it uses less digits than its factorization.

2211221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798 (or 761 counting only the distinct ones).

The product of its digits is 32, while the sum is 15.

The square root of 2211221121 is about 47023.6230101425. The cubic root of 2211221121 is about 1302.7989243709.

Adding to 2211221121 its reverse (1211221122), we get a palindrome (3422442243).

Subtracting from 2211221121 its reverse (1211221122), we obtain a palindrome (999999999).

The spelling of 2211221121 in words is "two billion, two hundred eleven million, two hundred twenty-one thousand, one hundred twenty-one".