11545221 has 16 divisors (see below), whose sum is σ = 16153344. Its totient is φ = 7326144.

The previous prime is 11545187. The next prime is 11545223. The reversal of 11545221 is 12254511.

It is not a de Polignac number, because 11545221 - 2¹⁷ = 11414149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11545223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4111 + ... + 6323.

It is an arithmetic number, because the mean of its divisors is an integer number (1009584).

Almost surely, 2^11545221 is an apocalyptic number.

It is an amenable number.

11545221 is a deficient number, since it is larger than the sum of its proper divisors (4608123).

11545221 is a wasteful number, since it uses less digits than its factorization.

11545221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300.

The product of its digits is 400, while the sum is 21.

The square root of 11545221 is about 3397.8259225570. The cubic root of 11545221 is about 226.0133453367.

Adding to 11545221 its reverse (12254511), we get a palindrome (23799732).

The spelling of 11545221 in words is "eleven million, five hundred forty-five thousand, two hundred twenty-one".