11121321 has 4 divisors (see below), whose sum is σ = 14828432. Its totient is φ = 7414212.

The previous prime is 11121307. The next prime is 11121329. The reversal of 11121321 is 12312111.

11121321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 11121321 - 2¹⁰ = 11120297 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11121297 and 11121306.

It is not an unprimeable number, because it can be changed into a prime (11121329) 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, 1853551 + ... + 1853556.

It is an arithmetic number, because the mean of its divisors is an integer number (3707108).

Almost surely, 2^11121321 is an apocalyptic number.

It is an amenable number.

11121321 is a deficient number, since it is larger than the sum of its proper divisors (3707111).

11121321 is an equidigital number, since it uses as much as digits as its factorization.

11121321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3707110.

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

The square root of 11121321 is about 3334.8644650120. The cubic root of 11121321 is about 223.2126441303.

Adding to 11121321 its reverse (12312111), we get a palindrome (23433432).

The spelling of 11121321 in words is "eleven million, one hundred twenty-one thousand, three hundred twenty-one".