11203423021 has 4 divisors (see below), whose sum is σ = 12803912032. Its totient is φ = 9602934012.

The previous prime is 11203423019. The next prime is 11203423031. The reversal of 11203423021 is 12032430211.

It is a happy number.

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: 12032430211 = 3307 ⋅3638473.

It is not a de Polignac number, because 11203423021 - 2¹ = 11203423019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 11203423021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203423031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 800244495 + ... + 800244508.

It is an arithmetic number, because the mean of its divisors is an integer number (3200978008).

Almost surely, 2^11203423021 is an apocalyptic number.

It is an amenable number.

11203423021 is a deficient number, since it is larger than the sum of its proper divisors (1600489011).

11203423021 is an equidigital number, since it uses as much as digits as its factorization.

11203423021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600489010.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 11203423021 its reverse (12032430211), we get a palindrome (23235853232).

The spelling of 11203423021 in words is "eleven billion, two hundred three million, four hundred twenty-three thousand, twenty-one".