1221020221112 has 16 divisors (see below), whose sum is σ = 2297860936800. Its totient is φ = 608257304640.

The previous prime is 1221020221111. The next prime is 1221020221121. The reversal of 1221020221112 is 2111220201221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221020221111) by changing a digit.

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, 281598437 + ... + 281602772.

It is an arithmetic number, because the mean of its divisors is an integer number (143616308550).

Almost surely, 2^{1221020221112} is an apocalyptic number.

It is an amenable number.

1221020221112 is a deficient number, since it is larger than the sum of its proper divisors (1076840715688).

1221020221112 is a wasteful number, since it uses less digits than its factorization.

1221020221112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 563201486 (or 563201482 counting only the distinct ones).

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

Adding to 1221020221112 its reverse (2111220201221), we get a palindrome (3332240422333).

The spelling of 1221020221112 in words is "one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred twelve".