2211111201221 has 4 divisors (see below), whose sum is σ = 2381196678252. Its totient is φ = 2041025724192.

The previous prime is 2211111201217. The next prime is 2211111201281. The reversal of 2211111201221 is 1221021111122.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 401938248196 + 1809172953025 = 633986^2 + 1345055^2 .

It is not a de Polignac number, because 2211111201221 - 2² = 2211111201217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2211111201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211111201281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85042738496 + ... + 85042738521.

It is an arithmetic number, because the mean of its divisors is an integer number (595299169563).

Almost surely, 2^{2211111201221} is an apocalyptic number.

It is an amenable number.

2211111201221 is a deficient number, since it is larger than the sum of its proper divisors (170085477031).

2211111201221 is a wasteful number, since it uses less digits than its factorization.

2211111201221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170085477030.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 2211111201221 its reverse (1221021111122), we get a palindrome (3432132312343).

Subtracting from 2211111201221 its reverse (1221021111122), we obtain a palindrome (990090090099).

The spelling of 2211111201221 in words is "two trillion, two hundred eleven billion, one hundred eleven million, two hundred one thousand, two hundred twenty-one".