11003221 has 4 divisors (see below), whose sum is σ = 11051500. Its totient is φ = 10954944.

The previous prime is 11003197. The next prime is 11003249. The reversal of 11003221 is 12230011.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12230011 = 47 ⋅260213.

It can be written as a sum of positive squares in 2 ways, for example, as 5574321 + 5428900 = 2361^2 + 2330^2 .

It is a cyclic number.

It is not a de Polignac number, because 11003221 - 2²³ = 2614613 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 11003198 and 11003207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11003021) 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, 23796 + ... + 24253.

It is an arithmetic number, because the mean of its divisors is an integer number (2762875).

Almost surely, 2^11003221 is an apocalyptic number.

It is an amenable number.

11003221 is a deficient number, since it is larger than the sum of its proper divisors (48279).

11003221 is an equidigital number, since it uses as much as digits as its factorization.

11003221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48278.

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 11003221 is about 3317.1103388341. The cubic root of 11003221 is about 222.4197143321.

Adding to 11003221 its reverse (12230011), we get a palindrome (23233232).

The spelling of 11003221 in words is "eleven million, three thousand, two hundred twenty-one".