12000000021111 has 24 divisors (see below), whose sum is σ = 18364152918384. Its totient is φ = 7524812102400.

The previous prime is 12000000021089. The next prime is 12000000021151. The reversal of 12000000021111 is 11112000000021.

It is a happy number.

It is not a de Polignac number, because 12000000021111 - 2⁹ = 12000000020599 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 = 12000000021093 and 12000000021102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000000021151) 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, 23705365 + ... + 24206286.

It is an arithmetic number, because the mean of its divisors is an integer number (765173038266).

Almost surely, 2^{12000000021111} is an apocalyptic number.

12000000021111 is a deficient number, since it is larger than the sum of its proper divisors (6364152897273).

12000000021111 is a wasteful number, since it uses less digits than its factorization.

12000000021111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47913311 (or 47913308 counting only the distinct ones).

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

Adding to 12000000021111 its reverse (11112000000021), we get a palindrome (23112000021132).

It can be divided in two parts, 12000000021 and 111, that multiplied together give a palindrome (1332000002331).

The spelling of 12000000021111 in words is "twelve trillion, twenty-one thousand, one hundred eleven".