1123021231 has 4 divisors (see below), whose sum is σ = 1125177264. Its totient is φ = 1120865200.

The previous prime is 1123021217. The next prime is 1123021247. The reversal of 1123021231 is 1321203211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1123021231 - 2¹³ = 1123013039 is a prime.

It is a super-2 number, since 2×1123021231² = 2522353370553510722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123021331) 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, 1077235 + ... + 1078276.

It is an arithmetic number, because the mean of its divisors is an integer number (281294316).

Almost surely, 2^1123021231 is an apocalyptic number.

1123021231 is a deficient number, since it is larger than the sum of its proper divisors (2156033).

1123021231 is an equidigital number, since it uses as much as digits as its factorization.

1123021231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2156032.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1123021231 is about 33511.5089334992. The cubic root of 1123021231 is about 1039.4317750861.

Adding to 1123021231 its reverse (1321203211), we get a palindrome (2444224442).

The spelling of 1123021231 in words is "one billion, one hundred twenty-three million, twenty-one thousand, two hundred thirty-one".