2111201222221 has 12 divisors (see below), whose sum is σ = 2644801531932. Its totient is φ = 1670400966528.

The previous prime is 2111201222203. The next prime is 2111201222231. The reversal of 2111201222221 is 1222221021112.

It can be written as a sum of positive squares in 2 ways, for example, as 181910780100 + 1929290442121 = 426510^2 + 1388989^2 .

It is not a de Polignac number, because 2111201222221 - 2²⁵ = 2111167667789 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111201222231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1657143180 + ... + 1657144453.

It is an arithmetic number, because the mean of its divisors is an integer number (220400127661).

Almost surely, 2^{2111201222221} is an apocalyptic number.

It is an amenable number.

2111201222221 is a deficient number, since it is larger than the sum of its proper divisors (533600309711).

2111201222221 is a wasteful number, since it uses less digits than its factorization.

2111201222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3314287660 (or 3314287653 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 2111201222221 its reverse (1222221021112), we get a palindrome (3333422243333).

It can be divided in two parts, 211120 and 1222221, that added together give a palindrome (1433341).

The spelling of 2111201222221 in words is "two trillion, one hundred eleven billion, two hundred one million, two hundred twenty-two thousand, two hundred twenty-one".