12021111 has 12 divisors (see below), whose sum is σ = 18119088. Its totient is φ = 7665504.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021111 is 11112021.

It is a happy number.

It is not a de Polignac number, because 12021111 - 2¹³ = 12012919 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 = 12021093 and 12021102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021131) 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 11 ways as a sum of consecutive naturals, for example, 28830 + ... + 29243.

It is an arithmetic number, because the mean of its divisors is an integer number (1509924).

Almost surely, 2^12021111 is an apocalyptic number.

12021111 is a deficient number, since it is larger than the sum of its proper divisors (6097977).

12021111 is a wasteful number, since it uses less digits than its factorization.

12021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58102 (or 58099 counting only the distinct ones).

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

The square root of 12021111 is about 3467.1473865413. The cubic root of 12021111 is about 229.0770257597.

Adding to 12021111 its reverse (11112021), we get a palindrome (23133132).

It can be divided in two parts, 12021 and 111, that multiplied together give a palindrome (1334331).

The spelling of 12021111 in words is "twelve million, twenty-one thousand, one hundred eleven".