11243203021 has 4 divisors (see below), whose sum is σ = 11243432092. Its totient is φ = 11242973952.

The previous prime is 11243203019. The next prime is 11243203063. The reversal of 11243203021 is 12030234211.

It is a happy number.

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 9523027396 + 1720175625 = 97586^2 + 41475^2 .

It is a cyclic number.

It is not a de Polignac number, because 11243203021 - 2¹ = 11243203019 is a prime.

It is a super-2 number, since 2×11243203021² (a number of 21 digits) contains 22 as substring.

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 11243203021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11243273021) 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, 7686 + ... + 150151.

It is an arithmetic number, because the mean of its divisors is an integer number (2810858023).

Almost surely, 2^11243203021 is an apocalyptic number.

It is an amenable number.

11243203021 is a deficient number, since it is larger than the sum of its proper divisors (229071).

11243203021 is an equidigital number, since it uses as much as digits as its factorization.

11243203021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229070.

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

Adding to 11243203021 its reverse (12030234211), we get a palindrome (23273437232).

The spelling of 11243203021 in words is "eleven billion, two hundred forty-three million, two hundred three thousand, twenty-one".