1221112220112 has 120 divisors (see below), whose sum is σ = 3516023588064. Its totient is φ = 395331985152.

The previous prime is 1221112220093. The next prime is 1221112220113. The reversal of 1221112220112 is 2110222111221.

1221112220112 is a `hidden beast` number, since 1 + 221 + 112 + 220 + 112 = 666.

It is a super-3 number, since 3×1221112220112³ (a number of 37 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221112220113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2796123 + ... + 3203205.

Almost surely, 2^{1221112220112} is an apocalyptic number.

1221112220112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1221112220112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1758011794032).

1221112220112 is an abundant number, since it is smaller than the sum of its proper divisors (2294911367952).

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

1221112220112 is a wasteful number, since it uses less digits than its factorization.

1221112220112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407697 (or 407688 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221112220112 its reverse (2110222111221), we get a palindrome (3331334331333).

The spelling of 1221112220112 in words is "one trillion, two hundred twenty-one billion, one hundred twelve million, two hundred twenty thousand, one hundred twelve".