201221201112111 has 12 divisors (see below), whose sum is σ = 290815312729240. Its totient is φ = 134072482787280.

The previous prime is 201221201112109. The next prime is 201221201112149. The reversal of 201221201112111 is 111211102122102.

It is a happy number.

201221201112111 is a `hidden beast` number, since 20 + 1 + 221 + 201 + 11 + 211 + 1 = 666.

It is not a de Polignac number, because 201221201112111 - 2¹ = 201221201112109 is a prime.

It is a super-2 number, since 2×201221201112111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201221201111111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6248701405 + ... + 6248733606.

Almost surely, 2^{201221201112111} is an apocalyptic number.

201221201112111 is a deficient number, since it is larger than the sum of its proper divisors (89594111617129).

201221201112111 is a wasteful number, since it uses less digits than its factorization.

201221201112111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12497436806 (or 12497436803 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 201221201112111 its reverse (111211102122102), we get a palindrome (312432303234213).

The spelling of 201221201112111 in words is "two hundred one trillion, two hundred twenty-one billion, two hundred one million, one hundred twelve thousand, one hundred eleven".