1221121101112 has 32 divisors (see below), whose sum is σ = 2529364780800. Its totient is φ = 548029029600.

The previous prime is 1221121101089. The next prime is 1221121101241. The reversal of 1221121101112 is 2111011211221.

It is a super-2 number, since 2×1221121101112² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 87818214 + ... + 87832117.

It is an arithmetic number, because the mean of its divisors is an integer number (79042649400).

Almost surely, 2^{1221121101112} is an apocalyptic number.

It is an amenable number.

1221121101112 is an abundant number, since it is smaller than the sum of its proper divisors (1308243679688).

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

1221121101112 is a wasteful number, since it uses less digits than its factorization.

1221121101112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175650427 (or 175650423 counting only the distinct ones).

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

Adding to 1221121101112 its reverse (2111011211221), we get a palindrome (3332132312333).

The spelling of 1221121101112 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred one thousand, one hundred twelve".