11223121 has 24 divisors (see below), whose sum is σ = 14230080. Its totient is φ = 8663616.

The previous prime is 11223109. The next prime is 11223131. The reversal of 11223121 is 12132211.

It is not a de Polignac number, because 11223121 - 2¹⁹ = 10698833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11223101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62610 + ... + 62788.

It is an arithmetic number, because the mean of its divisors is an integer number (592920).

Almost surely, 2^11223121 is an apocalyptic number.

It is an amenable number.

11223121 is a deficient number, since it is larger than the sum of its proper divisors (3006959).

11223121 is a wasteful number, since it uses less digits than its factorization.

11223121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265 (or 252 counting only the distinct ones).

The product of its digits is 24, while the sum is 13.

The square root of 11223121 is about 3350.0926852850. The cubic root of 11223121 is about 223.8916421598.

Adding to 11223121 its reverse (12132211), we get a palindrome (23355332).

The spelling of 11223121 in words is "eleven million, two hundred twenty-three thousand, one hundred twenty-one".