1122112121220 has 144 divisors (see below), whose sum is σ = 3419350526592. Its totient is φ = 297859008000.

The previous prime is 1122112121203. The next prime is 1122112121257. The reversal of 1122112121220 is 221212112211.

1122112121220 is a `hidden beast` number, since 11 + 221 + 1 + 212 + 1 + 220 = 666.

It is a super-2 number, since 2×1122112121220² (a number of 25 digits) contains 22 as substring.

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 = 1122112121193 and 1122112121202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86422849 + ... + 86435831.

It is an arithmetic number, because the mean of its divisors is an integer number (23745489768).

Almost surely, 2^{1122112121220} is an apocalyptic number.

1122112121220 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 1122112121220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1709675263296).

1122112121220 is an abundant number, since it is smaller than the sum of its proper divisors (2297238405372).

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

1122112121220 is a wasteful number, since it uses less digits than its factorization.

1122112121220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15162 (or 15157 counting only the distinct ones).

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

Adding to 1122112121220 its reverse (221212112211), we get a palindrome (1343324233431).

Subtracting from 1122112121220 its reverse (221212112211), we obtain a palindrome (900900009009).

The spelling of 1122112121220 in words is "one trillion, one hundred twenty-two billion, one hundred twelve million, one hundred twenty-one thousand, two hundred twenty".