1121133220 has 12 divisors (see below), whose sum is σ = 2354379804. Its totient is φ = 448453280.

The previous prime is 1121133103. The next prime is 1121133227. The reversal of 1121133220 is 223311211.

It can be written as a sum of positive squares in 2 ways, for example, as 720492964 + 400640256 = 26842^2 + 20016^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1121133194 and 1121133203.

It is not an unprimeable number, because it can be changed into a prime (1121133227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28028311 + ... + 28028350.

It is an arithmetic number, because the mean of its divisors is an integer number (196198317).

Almost surely, 2^1121133220 is an apocalyptic number.

1121133220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121133220 is an abundant number, since it is smaller than the sum of its proper divisors (1233246584).

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

1121133220 is a wasteful number, since it uses less digits than its factorization.

1121133220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56056670 (or 56056668 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1121133220 is about 33483.3274929479. The cubic root of 1121133220 is about 1038.8489545795.

Adding to 1121133220 its reverse (223311211), we get a palindrome (1344444431).

The spelling of 1121133220 in words is "one billion, one hundred twenty-one million, one hundred thirty-three thousand, two hundred twenty".