5511221 has 4 divisors (see below), whose sum is σ = 5564832. Its totient is φ = 5457612.

The previous prime is 5511203. The next prime is 5511223. The reversal of 5511221 is 1221155.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5511221 - 2⁶ = 5511157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5511221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5511223) 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, 26651 + ... + 26856.

It is an arithmetic number, because the mean of its divisors is an integer number (1391208).

Almost surely, 2^5511221 is an apocalyptic number.

It is an amenable number.

5511221 is a deficient number, since it is larger than the sum of its proper divisors (53611).

5511221 is a wasteful number, since it uses less digits than its factorization.

5511221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53610.

The product of its digits is 100, while the sum is 17.

The square root of 5511221 is about 2347.5989861985. The cubic root of 5511221 is about 176.6373777639.

Adding to 5511221 its reverse (1221155), we get a palindrome (6732376).

The spelling of 5511221 in words is "five million, five hundred eleven thousand, two hundred twenty-one".