1221011221112 has 16 divisors (see below), whose sum is σ = 2289419367840. Its totient is φ = 610499389696.

The previous prime is 1221011221093. The next prime is 1221011221117. The reversal of 1221011221112 is 2111221101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221011221117) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 117128 + ... + 1567080.

It is an arithmetic number, because the mean of its divisors is an integer number (143088710490).

Almost surely, 2^{1221011221112} is an apocalyptic number.

It is an amenable number.

1221011221112 is a deficient number, since it is larger than the sum of its proper divisors (1068408146728).

1221011221112 is a wasteful number, since it uses less digits than its factorization.

1221011221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555222 (or 1555218 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1221011221112 its reverse (2111221101221), we get a palindrome (3332232322333).

The spelling of 1221011221112 in words is "one trillion, two hundred twenty-one billion, eleven million, two hundred twenty-one thousand, one hundred twelve".