1121221212012 has 192 divisors, whose sum is σ = 3206211724800. Its totient is φ = 336016200960.

The previous prime is 1121221211993. The next prime is 1121221212061. The reversal of 1121221212012 is 2102121221211.

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 77914914 + ... + 77929302.

It is an arithmetic number, because the mean of its divisors is an integer number (16699019400).

Almost surely, 2^{1121221212012} is an apocalyptic number.

1121221212012 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 1121221212012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1603105862400).

1121221212012 is an abundant number, since it is smaller than the sum of its proper divisors (2084990512788).

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

1121221212012 is a wasteful number, since it uses less digits than its factorization.

1121221212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15133 (or 15125 counting only the distinct ones).

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

Adding to 1121221212012 its reverse (2102121221211), we get a palindrome (3223342433223).

The spelling of 1121221212012 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, twelve".