12211420 has 48 divisors (see below), whose sum is σ = 28068768. Its totient is φ = 4435200.

The previous prime is 12211403. The next prime is 12211421. The reversal of 12211420 is 2411221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 12211420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211421) 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, 17070 + ... + 17770.

It is an arithmetic number, because the mean of its divisors is an integer number (584766).

Almost surely, 2^12211420 is an apocalyptic number.

12211420 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 12211420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14034384).

12211420 is an abundant number, since it is smaller than the sum of its proper divisors (15857348).

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

12211420 is a wasteful number, since it uses less digits than its factorization.

12211420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 790 (or 788 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 12211420 is about 3494.4842251754. The cubic root of 12211420 is about 230.2795592459.

Adding to 12211420 its reverse (2411221), we get a palindrome (14622641).

The spelling of 12211420 in words is "twelve million, two hundred eleven thousand, four hundred twenty".