11123421 has 16 divisors (see below), whose sum is σ = 15897984. Its totient is φ = 6899904.

The previous prime is 11123393. The next prime is 11123471. The reversal of 11123421 is 12432111.

11123421 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 11123421 - 2¹⁴ = 11107037 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 11123421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11123471) 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, 375 + ... + 4731.

It is an arithmetic number, because the mean of its divisors is an integer number (993624).

Almost surely, 2^11123421 is an apocalyptic number.

It is an amenable number.

11123421 is a deficient number, since it is larger than the sum of its proper divisors (4774563).

11123421 is a wasteful number, since it uses less digits than its factorization.

11123421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4420.

The product of its digits is 48, while the sum is 15.

The square root of 11123421 is about 3335.1793055247. The cubic root of 11123421 is about 223.2266927327.

Adding to 11123421 its reverse (12432111), we get a palindrome (23555532).

It can be divided in two parts, 111 and 23421, that added together give a palindrome (23532).

The spelling of 11123421 in words is "eleven million, one hundred twenty-three thousand, four hundred twenty-one".