201111220221 has 16 divisors (see below), whose sum is σ = 269827599360. Its totient is φ = 133234703280.

The previous prime is 201111220129. The next prime is 201111220223. The reversal of 201111220221 is 122022111102.

It is not a de Polignac number, because 201111220221 - 2¹⁴ = 201111203837 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 201111220221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201111220223) 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, 4711786 + ... + 4754276.

It is an arithmetic number, because the mean of its divisors is an integer number (16864224960).

Almost surely, 2^201111220221 is an apocalyptic number.

It is an amenable number.

201111220221 is a deficient number, since it is larger than the sum of its proper divisors (68716379139).

201111220221 is a wasteful number, since it uses less digits than its factorization.

201111220221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52336.

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

Adding to 201111220221 its reverse (122022111102), we get a palindrome (323133331323).

The spelling of 201111220221 in words is "two hundred one billion, one hundred eleven million, two hundred twenty thousand, two hundred twenty-one".