1220111111112 has 128 divisors (see below), whose sum is σ = 3170625638400. Its totient is φ = 390930997248.

The previous prime is 1220111111099. The next prime is 1220111111113. The reversal of 1220111111112 is 2111111110221.

It is a super-2 number, since 2×1220111111112² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220111111091 and 1220111111100.

It is not an unprimeable number, because it can be changed into a prime (1220111111113) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102498553 + ... + 102510455.

It is an arithmetic number, because the mean of its divisors is an integer number (24770512800).

Almost surely, 2^{1220111111112} is an apocalyptic number.

1220111111112 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 1220111111112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1585312819200).

1220111111112 is an abundant number, since it is smaller than the sum of its proper divisors (1950514527288).

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

1220111111112 is a wasteful number, since it uses less digits than its factorization.

1220111111112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13335 (or 13331 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 1220111111112 its reverse (2111111110221), we get a palindrome (3331222221333).

The spelling of 1220111111112 in words is "one trillion, two hundred twenty billion, one hundred eleven million, one hundred eleven thousand, one hundred twelve".