1221021110112 has 48 divisors (see below), whose sum is σ = 3238223535792. Its totient is φ = 402811084800.

The previous prime is 1221021110093. The next prime is 1221021110129. The reversal of 1221021110112 is 2110111201221.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 1221021110091 and 1221021110100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65552389 + ... + 65571012.

It is an arithmetic number, because the mean of its divisors is an integer number (67462990329).

Almost surely, 2^{1221021110112} is an apocalyptic number.

1221021110112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221021110112 is an abundant number, since it is smaller than the sum of its proper divisors (2017202425680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221021110112 is a wasteful number, since it uses less digits than its factorization.

1221021110112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131123511 (or 131123503 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1221021110112 its reverse (2110111201221), we get a palindrome (3331132311333).

The spelling of 1221021110112 in words is "one trillion, two hundred twenty-one billion, twenty-one million, one hundred ten thousand, one hundred twelve".