1123310021 has 4 divisors (see below), whose sum is σ = 1123591500. Its totient is φ = 1123028544.

The previous prime is 1123309907. The next prime is 1123310033. The reversal of 1123310021 is 1200133211.

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

It can be written as a sum of positive squares in 2 ways, for example, as 117722500 + 1005587521 = 10850^2 + 31711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123310021 - 2¹⁴ = 1123293637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123309978 and 1123310005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123310051) 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, 134666 + ... + 142763.

It is an arithmetic number, because the mean of its divisors is an integer number (280897875).

Almost surely, 2^1123310021 is an apocalyptic number.

It is an amenable number.

1123310021 is a deficient number, since it is larger than the sum of its proper divisors (281479).

1123310021 is an equidigital number, since it uses as much as digits as its factorization.

1123310021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281478.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 1123310021 is about 33515.8174747387. The cubic root of 1123310021 is about 1039.5208656473.

Adding to 1123310021 its reverse (1200133211), we get a palindrome (2323443232).

It can be divided in two parts, 112 and 3310021, that added together give a palindrome (3310133).

The spelling of 1123310021 in words is "one billion, one hundred twenty-three million, three hundred ten thousand, twenty-one".