1101123220 has 24 divisors (see below), whose sum is σ = 2317437864. Its totient is φ = 439481856.

The previous prime is 1101123187. The next prime is 1101123227. The reversal of 1101123220 is 223211011.

It can be written as a sum of positive squares in 4 ways, for example, as 671224464 + 429898756 = 25908^2 + 20734^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1101123220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101123227) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 51097 + ... + 69376.

It is an arithmetic number, because the mean of its divisors is an integer number (96559911).

Almost surely, 2^1101123220 is an apocalyptic number.

1101123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1101123220 is an abundant number, since it is smaller than the sum of its proper divisors (1216314644).

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

1101123220 is a wasteful number, since it uses less digits than its factorization.

1101123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120939 (or 120937 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1101123220 is about 33183.1767617267. The cubic root of 1101123220 is about 1032.6313528030.

Adding to 1101123220 its reverse (223211011), we get a palindrome (1324334231).

The spelling of 1101123220 in words is "one billion, one hundred one million, one hundred twenty-three thousand, two hundred twenty".