11405221 has 4 divisors (see below), whose sum is σ = 11436172. Its totient is φ = 11374272.

The previous prime is 11405201. The next prime is 11405239. The reversal of 11405221 is 12250411.

11405221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12250411 = 71 ⋅172541.

It can be written as a sum of positive squares in 2 ways, for example, as 5085025 + 6320196 = 2255^2 + 2514^2 .

It is a cyclic number.

It is not a de Polignac number, because 11405221 - 2¹⁵ = 11372453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11405195 and 11405204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11405201) 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, 14916 + ... + 15661.

It is an arithmetic number, because the mean of its divisors is an integer number (2859043).

Almost surely, 2^11405221 is an apocalyptic number.

It is an amenable number.

11405221 is a deficient number, since it is larger than the sum of its proper divisors (30951).

11405221 is an equidigital number, since it uses as much as digits as its factorization.

11405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30950.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 11405221 is about 3377.1616780960. The cubic root of 11405221 is about 225.0960643290.

Adding to 11405221 its reverse (12250411), we get a palindrome (23655632).

The spelling of 11405221 in words is "eleven million, four hundred five thousand, two hundred twenty-one".