1221021300112 has 20 divisors (see below), whose sum is σ = 2369626199296. Its totient is φ = 609504861600.

The previous prime is 1221021300089. The next prime is 1221021300113. The reversal of 1221021300112 is 2110031201221.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (1221021300113) by changing a digit.

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, 62851764 + ... + 62871187.

Almost surely, 2^{1221021300112} is an apocalyptic number.

It is an amenable number.

1221021300112 is a deficient number, since it is larger than the sum of its proper divisors (1148604899184).

1221021300112 is a wasteful number, since it uses less digits than its factorization.

1221021300112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125723566 (or 125723560 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 1221021300112 its reverse (2110031201221), we get a palindrome (3331052501333).

The spelling of 1221021300112 in words is "one trillion, two hundred twenty-one billion, twenty-one million, three hundred thousand, one hundred twelve".