1123313021 has 4 divisors (see below), whose sum is σ = 1123563552. Its totient is φ = 1123062492.

The previous prime is 1123312997. The next prime is 1123313027. The reversal of 1123313021 is 1203133211.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123313021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123313027) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 118415 + ... + 127548.

It is an arithmetic number, because the mean of its divisors is an integer number (280890888).

Almost surely, 2^1123313021 is an apocalyptic number.

It is an amenable number.

1123313021 is a deficient number, since it is larger than the sum of its proper divisors (250531).

1123313021 is an equidigital number, since it uses as much as digits as its factorization.

1123313021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250530.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1123313021 is about 33515.8622296966. The cubic root of 1123313021 is about 1039.5217910552.

Adding to 1123313021 its reverse (1203133211), we get a palindrome (2326446232).

It can be divided in two parts, 112 and 3313021, that added together give a palindrome (3313133).

The spelling of 1123313021 in words is "one billion, one hundred twenty-three million, three hundred thirteen thousand, twenty-one".