1200100012218 has 96 divisors (see below), whose sum is σ = 2706503155200. Its totient is φ = 383854681728.

The previous prime is 1200100012169. The next prime is 1200100012219. The reversal of 1200100012218 is 8122100010021.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1200100012218.

It is not an unprimeable number, because it can be changed into a prime (1200100012219) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 238918455 + ... + 238923477.

It is an arithmetic number, because the mean of its divisors is an integer number (28192741200).

Almost surely, 2^{1200100012218} is an apocalyptic number.

1200100012218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1200100012218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1353251577600).

1200100012218 is an abundant number, since it is smaller than the sum of its proper divisors (1506403142982).

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

1200100012218 is a wasteful number, since it uses less digits than its factorization.

1200100012218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7796 (or 7793 counting only the distinct ones).

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

Adding to 1200100012218 its reverse (8122100010021), we get a palindrome (9322200022239).

The spelling of 1200100012218 in words is "one trillion, two hundred billion, one hundred million, twelve thousand, two hundred eighteen".