12001011111 has 12 divisors (see below), whose sum is σ = 17976823592. Its totient is φ = 8000673912.

The previous prime is 12001011109. The next prime is 12001011119. The reversal of 12001011111 is 11111010021.

It is not a de Polignac number, because 12001011111 - 2¹ = 12001011109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12001011093 and 12001011102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001011119) 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, 24693196 + ... + 24693681.

Almost surely, 2^12001011111 is an apocalyptic number.

12001011111 is a deficient number, since it is larger than the sum of its proper divisors (5975812481).

12001011111 is an frugal number, since it uses more digits than its factorization.

12001011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49386892 (or 49386880 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 9.

Adding to 12001011111 its reverse (11111010021), we get a palindrome (23112021132).

The spelling of 12001011111 in words is "twelve billion, one million, eleven thousand, one hundred eleven".