12210120018 has 24 divisors (see below), whose sum is σ = 28011452508. Its totient is φ = 3830625792.

The previous prime is 12210120017. The next prime is 12210120031. The reversal of 12210120018 is 81002101221.

It can be written as a sum of positive squares in 2 ways, for example, as 9390191409 + 2819928609 = 96903^2 + 53103^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (12210120011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19950871 + ... + 19951482.

Almost surely, 2^12210120018 is an apocalyptic number.

12210120018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12210120018 is an abundant number, since it is smaller than the sum of its proper divisors (15801332490).

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

12210120018 is a wasteful number, since it uses less digits than its factorization.

12210120018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39902378 (or 39902375 counting only the distinct ones).

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

Adding to 12210120018 its reverse (81002101221), we get a palindrome (93212221239).

The spelling of 12210120018 in words is "twelve billion, two hundred ten million, one hundred twenty thousand, eighteen".