1221220120112 has 20 divisors (see below), whose sum is σ = 2373135102936. Its totient is φ = 608798158080.

The previous prime is 1221220120079. The next prime is 1221220120121. The reversal of 1221220120112 is 2110210221221.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 113238314 + ... + 113249097.

Almost surely, 2^{1221220120112} is an apocalyptic number.

It is an amenable number.

1221220120112 is a deficient number, since it is larger than the sum of its proper divisors (1151914982824).

1221220120112 is a wasteful number, since it uses less digits than its factorization.

1221220120112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226487756 (or 226487750 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 1221220120112 its reverse (2110210221221), we get a palindrome (3331430341333).

The spelling of 1221220120112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred twenty thousand, one hundred twelve".