11512221 has 8 divisors (see below), whose sum is σ = 17542464. Its totient is φ = 6578400.

The previous prime is 11512219. The next prime is 11512223. The reversal of 11512221 is 12221511.

It is an interprime number because it is at equal distance from previous prime (11512219) and next prime (11512223).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11512221 - 2¹ = 11512219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11512221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11512223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274080 + ... + 274121.

It is an arithmetic number, because the mean of its divisors is an integer number (2192808).

Almost surely, 2^11512221 is an apocalyptic number.

It is an amenable number.

11512221 is a deficient number, since it is larger than the sum of its proper divisors (6030243).

11512221 is an equidigital number, since it uses as much as digits as its factorization.

11512221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548211.

The product of its digits is 40, while the sum is 15.

The square root of 11512221 is about 3392.9664012483. The cubic root of 11512221 is about 225.7977999343.

Adding to 11512221 its reverse (12221511), we get a palindrome (23733732).

The spelling of 11512221 in words is "eleven million, five hundred twelve thousand, two hundred twenty-one".