1101222120 has 128 divisors (see below), whose sum is σ = 3412886400. Its totient is φ = 284046336.

The previous prime is 1101222119. The next prime is 1101222137. The reversal of 1101222120 is 212221011.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1101222096 and 1101222105.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 874051 + ... + 875309.

It is an arithmetic number, because the mean of its divisors is an integer number (26663175).

Almost surely, 2^1101222120 is an apocalyptic number.

1101222120 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 1101222120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1706443200).

1101222120 is an abundant number, since it is smaller than the sum of its proper divisors (2311664280).

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

1101222120 is a wasteful number, since it uses less digits than its factorization.

1101222120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1507 (or 1503 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1101222120 is about 33184.6669412245. Note that the first 3 decimals coincide. The cubic root of 1101222120 is about 1032.6622679575.

Adding to 1101222120 its reverse (212221011), we get a palindrome (1313443131).

The spelling of 1101222120 in words is "one billion, one hundred one million, two hundred twenty-two thousand, one hundred twenty".