12212111021100 has 72 divisors (see below), whose sum is σ = 35545287122688. Its totient is φ = 3237062548800.

The previous prime is 12212111021039. The next prime is 12212111021171. The reversal of 12212111021100 is 112011121221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 12212111021100.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 121827256 + ... + 121927455.

Almost surely, 2^{12212111021100} is an apocalyptic number.

12212111021100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12212111021100 is an abundant number, since it is smaller than the sum of its proper divisors (23333176101588).

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

12212111021100 is a wasteful number, since it uses less digits than its factorization.

12212111021100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243754895 (or 243754888 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 12212111021100 its reverse (112011121221), we get a palindrome (12324122142321).

The spelling of 12212111021100 in words is "twelve trillion, two hundred twelve billion, one hundred eleven million, twenty-one thousand, one hundred".