201201221111 has 4 divisors (see below), whose sum is σ = 219492241224. Its totient is φ = 182910201000.

The previous prime is 201201221093. The next prime is 201201221113. The reversal of 201201221111 is 111122102102.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201201221111 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 (201201221113) 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, 9145510040 + ... + 9145510061.

It is an arithmetic number, because the mean of its divisors is an integer number (54873060306).

Almost surely, 2^201201221111 is an apocalyptic number.

201201221111 is a deficient number, since it is larger than the sum of its proper divisors (18291020113).

201201221111 is a wasteful number, since it uses less digits than its factorization.

201201221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18291020112.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 201201221111 its reverse (111122102102), we get a palindrome (312323323213).

The spelling of 201201221111 in words is "two hundred one billion, two hundred one million, two hundred twenty-one thousand, one hundred eleven".