201221220111 has 32 divisors (see below), whose sum is σ = 270712316160. Its totient is φ = 132946058496.

The previous prime is 201221220107. The next prime is 201221220113. The reversal of 201221220111 is 111022122102.

It is not a de Polignac number, because 201221220111 - 2² = 201221220107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221220113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 234796795 + ... + 234797651.

It is an arithmetic number, because the mean of its divisors is an integer number (8459759880).

Almost surely, 2^201221220111 is an apocalyptic number.

201221220111 is a deficient number, since it is larger than the sum of its proper divisors (69491096049).

201221220111 is a wasteful number, since it uses less digits than its factorization.

201221220111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2263.

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

Adding to 201221220111 its reverse (111022122102), we get a palindrome (312243342213).

The spelling of 201221220111 in words is "two hundred one billion, two hundred twenty-one million, two hundred twenty thousand, one hundred eleven".