1121212221012 has 48 divisors (see below), whose sum is σ = 3130450079680. Its totient is φ = 344988375264.

The previous prime is 1121212221011. The next prime is 1121212221067. The reversal of 1121212221012 is 2101222121211.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121212221011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399290698 + ... + 399293505.

Almost surely, 2^{1121212221012} is an apocalyptic number.

1121212221012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1121212221012 is an abundant number, since it is smaller than the sum of its proper divisors (2009237858668).

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

1121212221012 is a wasteful number, since it uses less digits than its factorization.

1121212221012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798584229 (or 798584221 counting only the distinct ones).

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

Adding to 1121212221012 its reverse (2101222121211), we get a palindrome (3222434342223).

The spelling of 1121212221012 in words is "one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twenty-one thousand, twelve".