12212118 has 12 divisors (see below), whose sum is σ = 26459628. Its totient is φ = 4070700.

The previous prime is 12212113. The next prime is 12212119. The reversal of 12212118 is 81121221.

It is a Harshad number since it is a multiple of its sum of digits (18), and also a Moran number because the ratio is a prime number: 678451 = 12212118 / (1 + 2 + 2 + 1 + 2 + 1 + 1 + 8).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12212118.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12212111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 339208 + ... + 339243.

It is an arithmetic number, because the mean of its divisors is an integer number (2204969).

Almost surely, 2^12212118 is an apocalyptic number.

12212118 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12212118 is an abundant number, since it is smaller than the sum of its proper divisors (14247510).

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

12212118 is a wasteful number, since it uses less digits than its factorization.

12212118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678459 (or 678456 counting only the distinct ones).

The product of its digits is 64, while the sum is 18.

The square root of 12212118 is about 3494.5840954254. The cubic root of 12212118 is about 230.2839467255.

Adding to 12212118 its reverse (81121221), we get a palindrome (93333339).

The spelling of 12212118 in words is "twelve million, two hundred twelve thousand, one hundred eighteen".