12111420 has 48 divisors (see below), whose sum is σ = 34278048. Its totient is φ = 3194880.

The previous prime is 12111419. The next prime is 12111427. The reversal of 12111420 is 2411121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 12111396 and 12111405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12111427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4780 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (714126).

Almost surely, 2^12111420 is an apocalyptic number.

12111420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12111420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17139024).

12111420 is an abundant number, since it is smaller than the sum of its proper divisors (22166628).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12111420 is a wasteful number, since it uses less digits than its factorization.

12111420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 12111420 is about 3480.1465486384. The cubic root of 12111420 is about 229.6492448205.

Adding to 12111420 its reverse (2411121), we get a palindrome (14522541).

The spelling of 12111420 in words is "twelve million, one hundred eleven thousand, four hundred twenty".