1123312221 has 6 divisors (see below), whose sum is σ = 1622562110. Its totient is φ = 748874808.

The previous prime is 1123312207. The next prime is 1123312271. The reversal of 1123312221 is 1222133211.

1123312221 is a `hidden beast` number, since 112 + 331 + 2 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 776235321 + 347076900 = 27861^2 + 18630^2 .

It is not a de Polignac number, because 1123312221 - 2⁷ = 1123312093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123312194 and 1123312203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123312271) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62406226 + ... + 62406243.

Almost surely, 2^1123312221 is an apocalyptic number.

It is an amenable number.

1123312221 is a deficient number, since it is larger than the sum of its proper divisors (499249889).

1123312221 is a wasteful number, since it uses less digits than its factorization.

1123312221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124812475 (or 124812472 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 1123312221 is about 33515.8502950470. The cubic root of 1123312221 is about 1039.5215442799.

Adding to 1123312221 its reverse (1222133211), we get a palindrome (2345445432).

The spelling of 1123312221 in words is "one billion, one hundred twenty-three million, three hundred twelve thousand, two hundred twenty-one".