11212221 has 16 divisors (see below), whose sum is σ = 15551424. Its totient is φ = 7179264.

The previous prime is 11212219. The next prime is 11212237. The reversal of 11212221 is 12221211.

11212221 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11212221 - 2¹ = 11212219 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11212197 and 11212206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11212291) 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, 8605 + ... + 9821.

It is an arithmetic number, because the mean of its divisors is an integer number (971964).

Almost surely, 2^11212221 is an apocalyptic number.

It is an amenable number.

11212221 is a deficient number, since it is larger than the sum of its proper divisors (4339203).

11212221 is a wasteful number, since it uses less digits than its factorization.

11212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1340.

The product of its digits is 16, while the sum is 12.

The square root of 11212221 is about 3348.4654694352. The cubic root of 11212221 is about 223.8191367971.

Adding to 11212221 its reverse (12221211), we get a palindrome (23433432).

The spelling of 11212221 in words is "eleven million, two hundred twelve thousand, two hundred twenty-one".