1100123220 has 96 divisors (see below), whose sum is σ = 3615591168. Its totient is φ = 244657152.

The previous prime is 1100123191. The next prime is 1100123221. The reversal of 1100123220 is 223210011.

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 = 1100123196 and 1100123205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1100123221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19857 + ... + 50936.

It is an arithmetic number, because the mean of its divisors is an integer number (37662408).

Almost surely, 2^1100123220 is an apocalyptic number.

1100123220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1100123220 is an abundant number, since it is smaller than the sum of its proper divisors (2515467948).

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

1100123220 is a wasteful number, since it uses less digits than its factorization.

1100123220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70849 (or 70847 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 1100123220 is about 33168.1054629293. The cubic root of 1100123220 is about 1032.3186587311.

Adding to 1100123220 its reverse (223210011), we get a palindrome (1323333231).

The spelling of 1100123220 in words is "one billion, one hundred million, one hundred twenty-three thousand, two hundred twenty".