1123023221 has 4 divisors (see below), whose sum is σ = 1123254732. Its totient is φ = 1122791712.

The previous prime is 1123023203. The next prime is 1123023227. The reversal of 1123023221 is 1223203211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1223203211 = 8539 ⋅143249.

It can be written as a sum of positive squares in 2 ways, for example, as 956974225 + 166048996 = 30935^2 + 12886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123023221 - 2²² = 1118828917 is a prime.

It is a super-2 number, since 2×1123023221² = 2522362309810429682, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1123023221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123023227) 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, 108320 + ... + 118233.

It is an arithmetic number, because the mean of its divisors is an integer number (280813683).

Almost surely, 2^1123023221 is an apocalyptic number.

It is an amenable number.

1123023221 is a deficient number, since it is larger than the sum of its proper divisors (231511).

1123023221 is an equidigital number, since it uses as much as digits as its factorization.

1123023221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231510.

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

The square root of 1123023221 is about 33511.5386247782. The cubic root of 1123023221 is about 1039.4323890454.

Adding to 1123023221 its reverse (1223203211), we get a palindrome (2346226432).

The spelling of 1123023221 in words is "one billion, one hundred twenty-three million, twenty-three thousand, two hundred twenty-one".