1221220111112 has 16 divisors (see below), whose sum is σ = 2289869298000. Its totient is φ = 610588298320.

The previous prime is 1221220111103. The next prime is 1221220111127. The reversal of 1221220111112 is 2111110221221.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2479862 + ... + 2931237.

It is an arithmetic number, because the mean of its divisors is an integer number (143116831125).

Almost surely, 2^{1221220111112} is an apocalyptic number.

It is an amenable number.

1221220111112 is a deficient number, since it is larger than the sum of its proper divisors (1068649186888).

1221220111112 is a wasteful number, since it uses less digits than its factorization.

1221220111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5439316 (or 5439312 counting only the distinct ones).

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

Adding to 1221220111112 its reverse (2111110221221), we get a palindrome (3332330332333).

The spelling of 1221220111112 in words is "one trillion, two hundred twenty-one billion, two hundred twenty million, one hundred eleven thousand, one hundred twelve".