1212222111012 has 144 divisors (see below), whose sum is σ = 3441024018432. Its totient is φ = 356647919040.

The previous prime is 1212222110999. The next prime is 1212222111091. The reversal of 1212222111012 is 2101112222121.

1212222111012 is digitally balanced in base 12, because in such base it contains all the possibile digits an equal number of times.

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

1212222111012 is strictly pandigital in base 12.

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 47 ways as a sum of consecutive naturals, for example, 2630533 + ... + 3056819.

It is an arithmetic number, because the mean of its divisors is an integer number (23896000128).

Almost surely, 2^{1212222111012} is an apocalyptic number.

1212222111012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212222111012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720512009216).

1212222111012 is an abundant number, since it is smaller than the sum of its proper divisors (2228801907420).

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

1212222111012 is a wasteful number, since it uses less digits than its factorization.

1212222111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426518 (or 426513 counting only the distinct ones).

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

Adding to 1212222111012 its reverse (2101112222121), we get a palindrome (3313334333133).

The spelling of 1212222111012 in words is "one trillion, two hundred twelve billion, two hundred twenty-two million, one hundred eleven thousand, twelve".