1123001021 has 4 divisors (see below), whose sum is σ = 1135619100. Its totient is φ = 1110382944.

The previous prime is 1123000999. The next prime is 1123001027. The reversal of 1123001021 is 1201003211.

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 514836100 + 608164921 = 22690^2 + 24661^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1123001021 is a prime.

It is a super-2 number, since 2×1123001021² = 2522262586334084882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1123000993 and 1123001011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123001027) 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, 6308906 + ... + 6309083.

It is an arithmetic number, because the mean of its divisors is an integer number (283904775).

Almost surely, 2^1123001021 is an apocalyptic number.

It is an amenable number.

1123001021 is a deficient number, since it is larger than the sum of its proper divisors (12618079).

1123001021 is an equidigital number, since it uses as much as digits as its factorization.

1123001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12618078.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1123001021 is about 33511.2073939451. The cubic root of 1123001021 is about 1039.4255398100.

Adding to 1123001021 its reverse (1201003211), we get a palindrome (2324004232).

The spelling of 1123001021 in words is "one billion, one hundred twenty-three million, one thousand, twenty-one".