1123213220 has 24 divisors (see below), whose sum is σ = 2379626424. Its totient is φ = 445308416.

The previous prime is 1123213213. The next prime is 1123213237. The reversal of 1123213220 is 223123211.

It can be written as a sum of positive squares in 4 ways, for example, as 120604324 + 1002608896 = 10982^2 + 31664^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246239 + ... + 250758.

It is an arithmetic number, because the mean of its divisors is an integer number (99151101).

Almost surely, 2^1123213220 is an apocalyptic number.

1123213220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1123213220 is an abundant number, since it is smaller than the sum of its proper divisors (1256413204).

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

1123213220 is a wasteful number, since it uses less digits than its factorization.

1123213220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497119 (or 497117 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 1123213220 is about 33514.3733344367. The cubic root of 1123213220 is about 1039.4910046270.

Adding to 1123213220 its reverse (223123211), we get a palindrome (1346336431).

Subtracting from 1123213220 its reverse (223123211), we obtain a palindrome (900090009).

The spelling of 1123213220 in words is "one billion, one hundred twenty-three million, two hundred thirteen thousand, two hundred twenty".