1123041021 has 4 divisors (see below), whose sum is σ = 1497388032. Its totient is φ = 748694012.

The previous prime is 1123041013. The next prime is 1123041043. The reversal of 1123041021 is 1201403211.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1201403211 = 3 ⋅400467737.

It is a cyclic number.

It is not a de Polignac number, because 1123041021 - 2³ = 1123041013 is a prime.

It is a super-2 number, since 2×1123041021² = 2522442269697444882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123051021) 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, 187173501 + ... + 187173506.

It is an arithmetic number, because the mean of its divisors is an integer number (374347008).

Almost surely, 2^1123041021 is an apocalyptic number.

It is an amenable number.

1123041021 is a deficient number, since it is larger than the sum of its proper divisors (374347011).

1123041021 is an equidigital number, since it uses as much as digits as its factorization.

1123041021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374347010.

The product of its (nonzero) digits is 48, while the sum is 15.

The square root of 1123041021 is about 33511.8042038921. The cubic root of 1123041021 is about 1039.4378807094.

Adding to 1123041021 its reverse (1201403211), we get a palindrome (2324444232).

The spelling of 1123041021 in words is "one billion, one hundred twenty-three million, forty-one thousand, twenty-one".