201221230111 has 32 divisors (see below), whose sum is σ = 225775065600. Its totient is φ = 177803527680.

The previous prime is 201221230097. The next prime is 201221230123. The reversal of 201221230111 is 111032122102.

It is a cyclic number.

It is not a de Polignac number, because 201221230111 - 2¹¹ = 201221228063 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221230811) 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, 15284950 + ... + 15298108.

It is an arithmetic number, because the mean of its divisors is an integer number (7055470800).

Almost surely, 2^201221230111 is an apocalyptic number.

201221230111 is a deficient number, since it is larger than the sum of its proper divisors (24553835489).

201221230111 is a wasteful number, since it uses less digits than its factorization.

201221230111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13519.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 201221230111 its reverse (111032122102), we get a palindrome (312253352213).

The spelling of 201221230111 in words is "two hundred one billion, two hundred twenty-one million, two hundred thirty thousand, one hundred eleven".