2211211221 has 16 divisors (see below), whose sum is σ = 3031381248. Its totient is φ = 1432857600.

The previous prime is 2211211201. The next prime is 2211211253. The reversal of 2211211221 is 1221121122.

It is not a de Polignac number, because 2211211221 - 2⁶ = 2211211157 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2211211221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211211201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165 + ... + 66501.

It is an arithmetic number, because the mean of its divisors is an integer number (189461328).

Almost surely, 2^2211211221 is an apocalyptic number.

It is an amenable number.

2211211221 is a deficient number, since it is larger than the sum of its proper divisors (820170027).

2211211221 is a wasteful number, since it uses less digits than its factorization.

2211211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66652.

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

The square root of 2211211221 is about 47023.5177437843. The cubic root of 2211211221 is about 1302.7969800864.

Adding to 2211211221 its reverse (1221121122), we get a palindrome (3432332343).

Subtracting from 2211211221 its reverse (1221121122), we obtain a palindrome (990090099).

It can be divided in two parts, 22112 and 11221, that added together give a palindrome (33333).

The spelling of 2211211221 in words is "two billion, two hundred eleven million, two hundred eleven thousand, two hundred twenty-one".