11203220221 has 4 divisors (see below), whose sum is σ = 11207869344. Its totient is φ = 11198571100.

The previous prime is 11203220219. The next prime is 11203220227. The reversal of 11203220221 is 12202230211.

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.

It is a cyclic number.

It is not a de Polignac number, because 11203220221 - 2¹ = 11203220219 is a prime.

It is a super-3 number, since 3×11203220221³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11203220195 and 11203220204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11203220227) 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, 2320945 + ... + 2325766.

It is an arithmetic number, because the mean of its divisors is an integer number (2801967336).

Almost surely, 2^11203220221 is an apocalyptic number.

It is an amenable number.

11203220221 is a deficient number, since it is larger than the sum of its proper divisors (4649123).

11203220221 is an equidigital number, since it uses as much as digits as its factorization.

11203220221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4649122.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 11203220221 its reverse (12202230211), we get a palindrome (23405450432).

The spelling of 11203220221 in words is "eleven billion, two hundred three million, two hundred twenty thousand, two hundred twenty-one".