201201111111 has 48 divisors (see below), whose sum is σ = 362171347200. Its totient is φ = 96480034560.

The previous prime is 201201111043. The next prime is 201201111161. The reversal of 201201111111 is 111111102102.

It is not a de Polignac number, because 201201111111 - 2¹³ = 201201102919 is a prime.

It is a super-2 number, since 2×201201111111² (a number of 23 digits) contains 22 as substring.

201201111111 is a modest number, since divided by 1111111 gives 20120 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201201111161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2537886 + ... + 2615963.

It is an arithmetic number, because the mean of its divisors is an integer number (7545236400).

Almost surely, 2^201201111111 is an apocalyptic number.

201201111111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

201201111111 is a deficient number, since it is larger than the sum of its proper divisors (160970236089).

201201111111 is a wasteful number, since it uses less digits than its factorization.

201201111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5153896 (or 5153883 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 201201111111 its reverse (111111102102), we get a palindrome (312312213213).

Subtracting from 201201111111 its reverse (111111102102), we obtain a palindrome (90090009009).

The spelling of 201201111111 in words is "two hundred one billion, two hundred one million, one hundred eleven thousand, one hundred eleven".