11535221 has 4 divisors (see below), whose sum is σ = 11551692. Its totient is φ = 11518752.

The previous prime is 11535217. The next prime is 11535229. The reversal of 11535221 is 12253511.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12253511 = 47 ⋅260713.

It can be written as a sum of positive squares in 2 ways, for example, as 10956100 + 579121 = 3310^2 + 761^2 .

It is a cyclic number.

It is not a de Polignac number, because 11535221 - 2² = 11535217 is a prime.

It is a super-2 number, since 2×11535221² = 266122647037682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11535193 and 11535202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11535229) 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, 7136 + ... + 8601.

It is an arithmetic number, because the mean of its divisors is an integer number (2887923).

Almost surely, 2^11535221 is an apocalyptic number.

It is an amenable number.

11535221 is a deficient number, since it is larger than the sum of its proper divisors (16471).

11535221 is an equidigital number, since it uses as much as digits as its factorization.

11535221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16470.

The product of its digits is 300, while the sum is 20.

The square root of 11535221 is about 3396.3540745923. The cubic root of 11535221 is about 225.9480719705.

Adding to 11535221 its reverse (12253511), we get a palindrome (23788732).

The spelling of 11535221 in words is "eleven million, five hundred thirty-five thousand, two hundred twenty-one".