1111122221220 has 384 divisors, whose sum is σ = 4034109381120. Its totient is φ = 250902282240.

The previous prime is 1111122221213. The next prime is 1111122221263. The reversal of 1111122221220 is 221222211111.

1111122221220 is a `hidden beast` number, since 111 + 112 + 2 + 221 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 1111122221193 and 1111122221202.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 9738342 + ... + 9851778.

It is an arithmetic number, because the mean of its divisors is an integer number (10505493180).

Almost surely, 2^{1111122221220} is an apocalyptic number.

1111122221220 is a gapful number since it is divisible by the number (10) 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 1111122221220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2017054690560).

1111122221220 is an abundant number, since it is smaller than the sum of its proper divisors (2922987159900).

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

1111122221220 is a wasteful number, since it uses less digits than its factorization.

1111122221220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113580 (or 113572 counting only the distinct ones).

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

Adding to 1111122221220 its reverse (221222211111), we get a palindrome (1332344432331).

It can be divided in two parts, 111112 and 2221220, that added together give a palindrome (2332332).

The spelling of 1111122221220 in words is "one trillion, one hundred eleven billion, one hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty".