12012220 has 24 divisors (see below), whose sum is σ = 27519408. Its totient is φ = 4368000.

The previous prime is 12012197. The next prime is 12012257. The reversal of 12012220 is 2221021.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a junction number, because it is equal to n+sod(n) for n = 12012197 and 12012206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27081 + ... + 27520.

It is an arithmetic number, because the mean of its divisors is an integer number (1146642).

Almost surely, 2^12012220 is an apocalyptic number.

12012220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12012220 is an abundant number, since it is smaller than the sum of its proper divisors (15507188).

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

12012220 is a wasteful number, since it uses less digits than its factorization.

12012220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54621 (or 54619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 12012220 is about 3465.8649714032. The cubic root of 12012220 is about 229.0205355242.

Adding to 12012220 its reverse (2221021), we get a palindrome (14233241).

The spelling of 12012220 in words is "twelve million, twelve thousand, two hundred twenty".