12001002111 has 24 divisors (see below), whose sum is σ = 20494325280. Its totient is φ = 6621241536.

The previous prime is 12001002107. The next prime is 12001002161. The reversal of 12001002111 is 11120010021.

It is a happy number.

It is not a de Polignac number, because 12001002111 - 2² = 12001002107 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 12001002093 and 12001002102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001002161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3282520 + ... + 3286173.

It is an arithmetic number, because the mean of its divisors is an integer number (853930220).

Almost surely, 2^12001002111 is an apocalyptic number.

12001002111 is a deficient number, since it is larger than the sum of its proper divisors (8493323169).

12001002111 is a wasteful number, since it uses less digits than its factorization.

12001002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6568735 (or 6568732 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 12001002111 its reverse (11120010021), we get a palindrome (23121012132).

It can be divided in two parts, 120010021 and 11, that multiplied together give a palindrome (1320110231).

The spelling of 12001002111 in words is "twelve billion, one million, two thousand, one hundred eleven".