1123203021 has 16 divisors (see below), whose sum is σ = 1504335936. Its totient is φ = 745445376.

The previous prime is 1123203013. The next prime is 1123203023. The reversal of 1123203021 is 1203023211.

It is not a de Polignac number, because 1123203021 - 2³ = 1123203013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1123203023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 973581 + ... + 974733.

It is an arithmetic number, because the mean of its divisors is an integer number (94020996).

Almost surely, 2^1123203021 is an apocalyptic number.

It is an amenable number.

1123203021 is a deficient number, since it is larger than the sum of its proper divisors (381132915).

1123203021 is a wasteful number, since it uses less digits than its factorization.

1123203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2332.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1123203021 is about 33514.2211754950. The cubic root of 1123203021 is about 1039.4878583557.

Adding to 1123203021 its reverse (1203023211), we get a palindrome (2326226232).

The spelling of 1123203021 in words is "one billion, one hundred twenty-three million, two hundred three thousand, twenty-one".