11203404221 has 4 divisors (see below), whose sum is σ = 11216092992. Its totient is φ = 11190715452.

The previous prime is 11203404211. The next prime is 11203404269. The reversal of 11203404221 is 12240430211.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11203404221 is a prime.

It is a super-2 number, since 2×11203404221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11203404193 and 11203404202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203404211) 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, 6343061 + ... + 6344826.

It is an arithmetic number, because the mean of its divisors is an integer number (2804023248).

Almost surely, 2^11203404221 is an apocalyptic number.

It is an amenable number.

11203404221 is a deficient number, since it is larger than the sum of its proper divisors (12688771).

11203404221 is an equidigital number, since it uses as much as digits as its factorization.

11203404221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12688770.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 11203404221 its reverse (12240430211), we get a palindrome (23443834432).

The spelling of 11203404221 in words is "eleven billion, two hundred three million, four hundred four thousand, two hundred twenty-one".