1121221212112 has 20 divisors (see below), whose sum is σ = 2225350638756. Its totient is φ = 546937176320.

The previous prime is 1121221212103. The next prime is 1121221212197. The reversal of 1121221212112 is 2112121221211.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 530327671696 + 590893540416 = 728236^2 + 768696^2 .

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1121221212112.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 854588683 + ... + 854589994.

Almost surely, 2^{1121221212112} is an apocalyptic number.

It is an amenable number.

1121221212112 is a deficient number, since it is larger than the sum of its proper divisors (1104129426644).

1121221212112 is a wasteful number, since it uses less digits than its factorization.

1121221212112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709178726 (or 1709178720 counting only the distinct ones).

The product of its digits is 64, while the sum is 19.

Adding to 1121221212112 its reverse (2112121221211), we get a palindrome (3233342433323).

Subtracting 1121221212112 from its reverse (2112121221211), we obtain a palindrome (990900009099).

The spelling of 1121221212112 in words is "one trillion, one hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twelve".